Quarterly Financial Information Disclosure [Abstract] Net sales Revenues Gross profit Gross Profit Income before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Net income Net Income (Loss) Attributable to Parent Earnings per share Earnings Per Share [Abstract] Basic (usd per share) Earnings Per Share, Basic Diluted (usd per share) Earnings Per Share, Diluted Retirement Benefits [Abstract] Employee Benefit and Retirement Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Document And Entity Information [Abstract] Document And Entity Information Abstract Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Trading Symbol Trading Symbol Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Current Reporting Status Entity Current Reporting Status Entity Voluntary Filers Entity Voluntary Filers Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Public Float Entity Public Float Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Income Statement Location [Axis] Income Statement Location [Axis] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Income Statement Location [Domain] Cost Of Sales And Distribution [Member] Cost Of Sales And Distribution [Member] Cost Of Sales And Distribution [Member] Selling And Marketing Expense [Member] Selling and Marketing Expense [Member] General And Administrative Expense [Member] General and Administrative Expense [Member] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Stock-based compensation expense, before income taxes Allocated Share-based Compensation Expense Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Exercise Price Range [Axis] Exercise Price Range [Axis] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] $22.77 - $23.96 [Member] Price Range One [Member] Price Range One [Member] $29.92- $34.11 [Member] Price Range Two [Member] Price Range Two [Member] $57.11 [Member] Price Range Three [Member] Price Range Three [Member] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Option price per share, lower range limit Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit Option price per share, upper range limit Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit Options outstanding Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options Options outstanding remaining life Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term Options outstanding exercise price Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price Options exercisable Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options Options exercisable exercise price Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Land [Member] Land [Member] Buildings And Improvements [Member] Building and Building Improvements [Member] Building And Improvements - Capital Leases [Member] Building And Improvements Capital Leases [Member] Building And Improvements Capital Leases [Member] Machinery And Equipment [Member] Machinery and Equipment [Member] Machinery And Equipment - Capital Leases [Member] Machinery And Equipment Capital Leases [Member] Machinery And Equipment Capital Leases [Member] Construction In Progress [Member] Construction in Progress [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Property, plant and equipment, gross Property, Plant and Equipment, Gross Less accumulated amortization and depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property, Plant and Equipment, Net, Total Property, Plant and Equipment, Net Amortization and depreciation expense on property, plant and equipment Other Depreciation and Amortization Accumulated amortization on capital leases Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Non Employee Directors [Member] Non Employee Directors [Member] Non Employee Directors [Member] Employees [Member] Employees [Member] Employees [Member] Stock Options [Member] Employee Stock Option [Member] Restricted Stock Units (RSUs) [Member] Restricted Stock Units (RSUs) [Member] Employee And Non Employee Director Service Based Restricted Stock Units [Member] Employee And Non Employee Director Service Based Restricted Stock Units [Member] Employee And Non Employee Director Service Based Restricted Stock Units [Member] Performance-Based Restricted Stock Tracking Units (RSTUs) [Member] Performance Based Restricted Stock Tracking Units Rstus [Member] Performance-Based Restricted Stock Tracking Units (RSTUs) [Member] Service-Based Restricted Stock Tracking Units (RSTUs) [Member] Service Based Restricted Stock Tracking Units Rstus [Member] Service-Based Restricted Stock Tracking Units (RSTUs) [Member] Restricted Stock Tracking Units (RSTUs) [Member] Restricted Stock Tracking Units Rstus [Member] Restricted Stock Tracking Units (RSTUs) [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Number of employee groups Number Of Employee Groups Number Of Employee Groups Number of stock-based compensation plans Number Of Stock Based Compensation Plans Number Of Stock Based Compensation Plans Number of stock incentive plans Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans Shares available for awards Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Contractual terms, years Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Vesting period, years Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Total fair value of options vested Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value Total unrecognized compensation expense related to unvested stock options granted Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options Expected to be recognized over a weighted average period Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Cash received from options exercised Proceeds from Stock Options Exercised Tax benefit realized from the tax deduction from option exercises Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Shares approved for grants Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Accrued compensation and related expenses Employee-related Liabilities, Current Number of performance periods Number Of Performance Periods Number Of Performance Periods Performance period Performance Period Performance Period Period to achieve cultural goals Period To Achieve Cultural Goals Period To Achieve Cultural Goals Debt Disclosure [Abstract] Loans Payable and Long-Term Debt Debt and Capital Leases Disclosures [Text Block] Potentially dilutive shares Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Earnings Per Share Earnings Per Share [Text Block] Schedule Of Earnings (Loss) Per Share, Basic And Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Employee Performance Based Restricted Stock Units [Member] Employee Performance Based Restricted Stock Units [Member] Employee Performance Based Restricted Stock Units [Member] Serviced-Based RSUs [Member] Serviced Based Restricted Stock Units [Member] Serviced Based Restricted Stock Units [Member] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Issued and outstanding, beginning balance Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Cancelled due to non-achievement of performance goals Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Cancelled Number Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Cancelled Number Settled in common stock Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Issued and outstanding, ending balance Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Weighted average grant date fair value, beginning balance Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Weighted average grant date fair value, Awarded Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Weighted average grant date fair value, cancelled due to non-achievement of performance goals Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options, Cancelled Weighted Average Grant Date Fair Value Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options, Cancelled Weighted Average Grant Date Fair Value Weighted average grant date fair value, settled in common shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Weighted average grant date fair value, forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Weighted average grant date fair value, ending balance Risks and Uncertainties [Abstract] Concentration Risk [Table] Concentration Risk [Table] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Accounts Receivable [Member] Accounts Receivable [Member] Sales Revenue, Gross [Member] Sales Revenue Gross [Member] Revenue from sale of goods and services rendered, in the normal course of business, before sales returns and allowances, and sales discounts, when it serves as a benchmark in a concentration of risk calculation. Customer [Axis] Customer [Axis] Customer [Domain] Customer [Domain] Customer A [Member] Customer A [Member] Customer A [Member] Customer B [Member] Customer B [Member] Customer B [Member] Concentration Risk [Line Items] Concentration Risk [Line Items] Concentration risk percentage Concentration Risk, Percentage Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] LEVEL 2 [Member] Fair Value, Inputs, Level 2 [Member] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Scenario, Forecast [Member] Scenario, Forecast [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] London Interbank Offered Rate (LIBOR) [Member] London Interbank Offered Rate (LIBOR) [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Lender Name [Axis] Lender Name [Axis] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Wells Fargo [Member] Wells Fargo [Member] Wells Fargo [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Subordinated Promissory Notes Payable To Certain Current And Former RSI Employees [Member] Subordinated Promissory Notes Payable To Certain Current And Former RSI Employees [Member] Subordinated Promissory Notes Payable To Certain Current And Former RSI Employees [Member] Initial Term Loan [Member] Initial Term Loan [Member] Initial Term Loan [Member] Delayed Draw Term Loan [Member] Delayed Draw Term Loan [Member] Delayed Draw Term Loan [Member] Allegany County, Maryland Site [Member] Allegany County Maryland Site [Member] Allegany County, Maryland Site [Member] First American Financial Bancorp [Member] First American Financial Bancorp [Member] First American Financial Bancorp [Member] e-Plus Group [Member] E Plus Group [Member] e-Plus Group [Member] West Virginia Economic Development Authority [Member] West Virginia Economic Development Authority [Member] West Virginia Economic Development Authority [Member] West Virginia Economic Development Authority, Originated in 2015 [Member] West Virginia Economic Development Authority, Originated In 2015 [Member] West Virginia Economic Development Authority, Originated In 2015 [Member] West Virginia Economic Development Authority, Originated in 2016 [Member] West Virginia Economic Development Authority, Originated In 2016 [Member] West Virginia Economic Development Authority, Originated in 2016 [Member] 4.875% Senior Notes Due 2026 [Member] 4.875% Senior Notes Due 2026 [Member] 4.875% Senior Notes Due 2026 [Member] RSI Notes [Member] RSI Notes [Member] RSI Notes [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other Noncurrent Assets [Member] Other Noncurrent Assets [Member] Long-term Debt [Member] Long-term Debt [Member] Income Statement Location [Domain] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Loans Payable [Member] Loans Payable [Member] Secured Debt [Member] Secured Debt [Member] Subordinated Debt [Member] Subordinated Debt [Member] Notes Payable to Banks [Member] Notes Payable to Banks [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Number Of Non-Employee Director Groups Number Of Non-Employee Director Groups Number Of Non-Employee Director Groups Repayments of Debt Repayments of Debt Debt Instrument, Repurchase Amount Debt Instrument, Repurchase Amount Repayments of Lines of Credit Repayments of Lines of Credit Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Amount outstanding Long-term Line of Credit LIBOR rate Debt Instrument, Interest Rate, Effective Percentage Spread on interest rate Debt Instrument, Basis Spread on Variable Rate Required minimum ratio of cash flow to fixed charges under agreement Required Minimum Ratio Of Cash Flow To Fixed Charges Under Agreement Required Minimum Ratio Of Cash Flow To Fixed Charges Under Agreement Applicable Funded Debt To EBITDA Ratio Applicable Funded Debt To EBITDA Ratio Applicable Funded Debt To EBITDA Ratio Ratio cash flow to fixed charges Ratio Cash Flow To Fixed Charges Ratio Cash Flow To Fixed Charges Total Secured Debt To EBITDA Ratio Total Secured Debt To EBITDA Ratio Total Secured Debt To EBITDA Ratio Fixed interest rate Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate Debt, outstanding balance Long-term Debt and Capital Lease Obligations, Including Current Maturities Number of loan agreements Number Of Loan Agreements Number Of Loan Agreements Number of capitalized lease agreements Number Of Capitalized Lease Agreements Number Of Capitalized Lease Agreements Capital lease obligations incurred Capital Lease Obligations Incurred Number Of Leases Number Of Leases Number Of Leases Capital lease term Capital Lease Term Capital Lease Term Number Of Leases 2 Number Of Leases 2 Number Of Leases 2 Capital Lease Term 2 Capital Lease Term 2 Capital Lease Term 2 Market interest rate Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate Capital lease agreement Capital Lease Obligations Loan agreement amount Debt Instrument, Face Amount Line Of Credit Facility, Agreement Terminated Line Of Credit Facility, Agreement Terminated Line Of Credit Facility, Agreement Terminated Proceeds from term loan Proceeds from Lines of Credit Debt instrument, interest rate, stated percentage Debt Instrument, Interest Rate, Stated Percentage New Markets Tax Credit Investment New Markets Tax Credit Investment New Markets Tax Credit Investment Notes, Loans and Financing Receivable, Net, Noncurrent Notes, Loans and Financing Receivable, Net, Noncurrent Loan term Debt Instrument, Term Amount drawn on loan Loans Payable New Markets Tax Credit, Recapture Period New Markets Tax Credit, Recapture Period New Markets Tax Credit, Recapture Period Debt issuance costs Debt Issuance Costs, Net Deferred Finance Costs, Amortization Period Deferred Finance Costs, Amortization Period Deferred Finance Costs, Amortization Period Line of Credit Facility, Commitment Fee Percentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Total Funded Debt To EBITDA Ratio Total Funded Debt To EBITDA Ratio Total Funded Debt To EBITDA Ratio Debt Instrument, Fair Value Disclosure Debt Instrument, Fair Value Disclosure Long-term Debt, Fair Value Long-term Debt, Fair Value Income Tax Disclosure [Abstract] Federal statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Federal income tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent Acquisition and integration costs Effective Income Tax Rate Reconciliation, Acquisition And Integration Costs, Percent Effective Income Tax Rate Reconciliation, Acquisition And Integration Costs, Percent Stock compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent Meals and entertainment Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment, Percent Effect of Tax Act Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Domestic production deduction Effective Income Tax Rate Reconciliation, Nondeductible Expense, Domestic Production Deduction, Percent Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to domestic production deduction. Other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent Total Effective Income Tax Rate Reconciliation, Total Adjustments To Federal Statutory Rate Effective Income Tax Rate Reconciliation, Total Adjustments To Federal Statutory Rate Effective federal income tax rate Effective Income Tax Rate Reconciliation, Effective Federal Income Tax Rate Effective Income Tax Rate Reconciliation, Effective Federal Income Tax Rate State income taxes, net of federal tax effect Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Income taxes paid Income Taxes Paid, Net SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] SEC Schedule, 12-09, Allowance, Credit Loss [Member] SEC Schedule, 12-09, Allowance, Credit Loss [Member] Reserve for Cash Discounts [Member] SEC Schedule, 12-09, Reserve, Cash Discounts [Member] SEC Schedule, 12-09, Reserve, Cash Discounts [Member] Reserve for Sales Returns and Allowances [Member] SEC Schedule, 12-09, Allowance, Returns [Member] SEC Schedule, 12-09, Allowance, Returns [Member] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] Balance at Beginning of Year SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount Additions (Reductions) Charged to Cost and Expenses SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense Other SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account Deductions SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction Balance at End of Year Activity Related to Unrecognized Tax Benefits Summary of Income Tax Contingencies [Table Text Block] Quarterly Financial Data (Unaudited) Quarterly Financial Information [Text Block] Accounting for Uncertainty in Income Taxes Accounting For Uncetainty In Income Taxes [Text Block] Accounting For Uncetainty In Income Taxes [Text Block] Net income Denominator for basic earnings per common share - weighted-average shares Weighted Average Number of Shares Outstanding, Basic Stock options and restricted stock units Weighted Average Number Diluted Shares Outstanding Adjustment Denominator for diluted earnings (loss) per common share - weighted-average shares and assumed conversions Weighted Average Number of Shares Outstanding, Diluted Net earnings per share, Basic (usd per share) Net earnings per share, Diluted (usd per share) Components Of Property, Plant And Equipment Property, Plant and Equipment [Table Text Block] Projected benefit obligation at beginning of year Defined Benefit Plan, Benefit Obligation Interest cost Defined Benefit Plan, Interest Cost Acturial (gains) and losses Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid Projected benefit obligation at end of year Fair value of plan assets at beginning of year Defined Benefit Plan, Plan Assets, Amount Actual return on plan assets Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Company contributions Defined Benefit Plan, Plan Assets, Contributions by Employer Benefits paid Defined Benefit Plan, Plan Assets, Benefits Paid Fair value of plan assets at end of year Funded status of the plan Defined Benefit Plan, Funded (Unfunded) Status of Plan Commitments and Contingencies Disclosure [Abstract] Reconciliation Of Warranty Liability Schedule of Product Warranty Liability [Table Text Block] Schedule Of Minimum Rental Requirements Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Business Combinations [Abstract] Preliminary Purchase Price Allocation Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Supplemental Pro Forma Financial Information Business Acquisition, Pro Forma Information [Table Text Block] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] 2018 Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 2019 Defined Benefit Plan, Expected Future Benefit Payment, Year Two 2020 Defined Benefit Plan, Expected Future Benefit Payment, Year Three 2021 Defined Benefit Plan, Expected Future Benefit Payment, Year Four 2022 Defined Benefit Plan, Expected Future Benefit Payment, Year Five Years 2023-2027 Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter Credit Concentration Concentration Risk Disclosure [Text Block] Weighted-average fair value of grants Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate Expected term in years Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected dividends yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Pro Forma [Member] Pro Forma [Member] Nonrecurring Adjustment [Axis] Nonrecurring Adjustment [Axis] Nonrecurring Adjustment [Domain] Nonrecurring Adjustment [Domain] Fair Value Adjustment to Inventory [Member] Fair Value Adjustment to Inventory [Member] Letter of Credit [Member] Letter of Credit [Member] Revolving Facility [Member] Revolving Facility [Member] Revolving Facility [Member] Credit Agreement [Member] Credit Agreement [Member] Credit Agreement [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] RSI Home Products, Inc. [Member] RSI Home Products, Inc. [Member] RSI Home Products, Inc. [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Loan facility term Indebtedness assumed (including accrued interest) Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities Total accounting consideration paid Business Combination, Consideration Transferred Cash consideration, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Newly issued shares (shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Value of newly issued common stock Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Price per share (usd per share) Share Price Goodwill, net Goodwill Customer receivables Receivables from Customers Allowance for returns and discounts Revenue Recognition, Sales Returns, Reserve for Sales Returns Allowance for doubtful accounts Allowance for Doubtful Accounts Receivable Operating profit Operating Income (Loss) Charge to cost of sales as a result of the step up of inventory Cost of Goods and Services Sold Transaction costs Business Combination, Acquisition Related Costs Statutory tax rate Borrowed under the Credit Agreement Amortization expense, net of tax Amortization of Debt Discount (Premium) Debt issuance costs Amortization of Debt Issuance Costs Amortization period Interest expense, net of tax Interest Expense, Debt Transaction expenses add-back, net of tax Business Acquisition, Transaction Costs, Add-Back, Net of Tax Business Acquisition, Transaction Costs, Add-Back, Net of Tax Summary Of Percentage Of Sales Summary Of Percentage Of Sales [Table Text Block] Summary Of Percentage Of Sales Accounting Policies [Abstract] Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Promotional Display [Member] Furniture and Fixtures [Member] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2018-02 [Member] Accounting Standards Update 2018-02 [Member] Accounting Standards Update 2018-02 [Member] ASU 2015-03 [Member] Accounting Standards Update 2015-03 [Member] ASU 2016-09, Statutory Tax Withholding Component [Member] Accounting Standards Update 2016-09, Statutory Tax Withholding Component [Member] Accounting Standards Update 2016-09, Statutory Tax Withholding Component [Member] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount Advertising costs Advertising Expense Cash equivalents Cash Equivalents, at Carrying Value Property, plant and equipment useful lives Property, Plant and Equipment, Useful Life Impairment of long-lived assets Impairment of Long-Lived Assets Held-for-use Net increase to beginning retained earnings Retained Earnings (Accumulated Deficit) Net decrease to accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Amortization Amortization Number of defined benefit pension plans Number Of Defined Benefit Pension Plans Number Of Defined Benefit Pension Plans Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities Principles of Consolidation and Basis of Presentation Consolidation And Presentation, Policy [Policy Text Block] Consolidation And Presentation, Policy Revenue Recognition Revenue Recognition Accounting Policy, Gross and Net Revenue Disclosure [Policy Text Block] Cost of Sales and Distribution Cost of Sales, Policy [Policy Text Block] Advertising Costs Advertising Cost, Policy, Expensed Advertising Cost [Policy Text Block] Cash and Cash Equivalents and Investments in Certificates of Deposit Cash and Cash Equivalents, Policy [Policy Text Block] Inventories Inventory, Policy [Policy Text Block] Property, Plant and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Impairment of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Promotional Displays Promotional Displays, Policy [Policy Text Block] Promotional Displays, Policy Income Taxes Income Tax, Policy [Policy Text Block] Pensions Pension and Other Postretirement Plans, Policy [Policy Text Block] Stock-Based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Reclassifications Reclassification, Policy [Policy Text Block] Schedule Of Debt Maturities Schedule of Maturities of Long-term Debt [Table Text Block] Acquisition of RSI Home Products, Inc. (the RSI Acquisition) Business Combination Disclosure [Text Block] Income Statement [Abstract] Cost of sales and distribution Gross Profit Selling and marketing expenses Selling and Marketing Expense General and administrative expenses General and Administrative Expense Operating Income Interest expense (income), net Interest Income (Expense), Net Other (income) expense Other Nonoperating Income (Expense) Income Before Income Taxes Income tax expense Income Tax Expense (Benefit) Net Income Term Loans [Member] Term Loans [Member] Term Loans [Member] Senior Notes [Member] Senior Notes [Member] Revolving Credit Facility [Member] Revolving Credit [Member] Revolving Credit [Member] Economic Development Loans [Member] Economic [Member] Economic [Member] Other Long-term Debt [Member] Other Long-Term Debt [Member] Other Long-Term Debt [Member] 2018 Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months 2019 Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two 2020 Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three 2021 Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four 2022 Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five 2023 and thereafter Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five Total Debt issuance costs Current maturities Long-term Debt and Capital Lease Obligations, Current Total long-term debt Long-term Debt and Capital Lease Obligations Schedule Of Weighted Average Assumptions And Valuation Of Stock Options Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule Of Stock Option Activity Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule Of Stock Options Oustanding Activity Schedule Of Share Based Compensation Stock Options Outstanding Activity [Table Text Block] Schedule Of Share Based Compensation Stock Options Outstanding Activity Summary Of RSU's Activity Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Stock-Based Compensation Expense Allocated Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Receivables [Abstract] Components Of Customer Receivables Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Statement of Comprehensive Income [Abstract] Other comprehensive income (loss) net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Change in pension benefits, net of deferred taxes of $9,510, $3,944 and $2,905, respectively Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Total Comprehensive Income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Customer Relationships [Member] Customer Relationships [Member] Trademarks [Member] Trademarks [Member] Intangibles Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Property, plant and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Inventories Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory Customer receivables Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Assets, Customer Receivables Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Assets, Customer Receivables Income taxes receivable Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Assets, Income Taxes Receivable Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Assets, Income Taxes Receivable Prepaid expenses and other Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets Leasehold interests Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Leasehold Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Leasehold Total identifiable assets and goodwill acquired Business Combination, Recognized Identifiable Assets Acquired And Goodwill Business Combination, Recognized Identifiable Assets Acquired And Goodwill Debt Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Debt Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Debt Deferred income taxes Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Accrued expenses Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accrued Expenses Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accrued Expenses Accounts payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable Notes payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Notes Payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Notes Payable Income taxes payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Income Taxes Payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Income Taxes Payable Total liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Total accounting consideration Inventory Disclosure [Abstract] Components Of Inventories Schedule of Inventory, Current [Table Text Block] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Significant Shareholders [Member] Majority Shareholder [Member] Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Warranty claims, period from original ship date Warranty Claims, Period From Original Ship Date Warranty Claims, Period From Original Ship Date Total rental expenses Operating Leases, Rent Expense, Minimum Rentals Reltaed party rent expense Related Party Transaction, Expenses from Transactions with Related Party Rent expense from remaining term Rent Expense From Remaining Term Rent Expense From Remaining Term Statement of Financial Position [Abstract] Preferred stock, par value Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares issued Preferred Stock, Shares Issued Common stock, no par value Common Stock, No Par Value Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Gross customer receivables Accounts Receivable, Gross, Current Allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current Allowance for returns and discounts Allowance For Returns And Discounts Allowance for returns and discounts Net customer receivables Accounts Receivable, Net, Current Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Defined Contribution Plan Name [Axis] Retirement Plan Name [Axis] Retirement Plan Name [Domain] Retirement Plan Name [Domain] 401(k) Plan [Member] 401(k) Plan [Member] 401(k) Plan [Member] ERROR in label resolution. American Woodmark Investment Savings Stock Ownership Plan [Member] American Woodmark Investment Savings Stock Ownership Plan [Member] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Other Postretirement Benefits Plan [Member] Other Postretirement Benefits Plan [Member] Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Bonds [Member] Bonds [Member] Equity Funds [Member] Equity Funds [Member] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Defined contribution plan, minimum age requirement Defined Contribution Plan, Minimum Age Defined Contribution Plan, Minimum Age Defined contribution plan, minimum consecutive months employed requirement Defined Contribution Plan, Minimum Consecutive Months Employed Defined Contribution Plan, Minimum Consecutive Months Employed Percent of after tax earnings contributed in profit sharing Defined Contribution Plan, Percent Of After Tax Earnings, Contribution, Percent Defined Contribution Plan, Percent Of After Tax Earnings, Contribution, Percent Recognized expenses for profit-sharing contributions Defined Contribution Plan, Employer Discretionary Contribution Amount 401(k) contributions, percent match of employee's annual contribution Defined Contribution Plan, Employer Matching Contribution, Percent of Match Effective maximum contribution of base earnings Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Expense for 401(k) matching contributions Defined Contribution Plan, Cost Eligibility period Defined Contribution Plan, Eligibility Period Defined Contribution Plan, Eligibility Period Maximum annual contribution per employee (as a percent) Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent Accumulated other comprehensive loss Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax Accumulated other comprehensive loss, net of tax Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Expected recognized net actuarial losses in net periodic pension benefit cost, before tax Defined Benefit Plan Expected Actuarial Gain Losses Next Fiscal Year Before Tax Defined Benefit Plan Expected Actuarial Gain Losses Next Fiscal Year Before Tax Expected recognized net actuarial losses in net periodic pension benefit cost, after tax Defined Benefit Plan Expected Actuarial Gain Losses Next Fiscal Year After Tax Defined Benefit Plan Expected Actuarial Gain Losses Next Fiscal Year After Tax Accumulated benefit obligation Defined Benefit Plan, Accumulated Benefit Obligation Expected company contributions to pension plan in 2015 Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year Plan asset actual allocation Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage Raw materials Inventory, Raw Materials, Gross Work-in-process Inventory, Work in Process, Gross Finished goods Inventory, Finished Goods, Gross Total FIFO inventories Inventory, Gross Reserve to adjust inventories to LIFO value Inventory, LIFO Reserve Total inventory Inventory, Net Carried under FIFO FIFO Inventory Amount Carried under LIFO LIFO Inventory Amount Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Oustanding number of options, Beginning Balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Options granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Options cancelled or expired Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Oustanding number of options ending balance Remaining contractual term outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Remaining contractual term, granted Share Based Compensation Arrangement By Sharebased Payment Award Options Granted Weighted Average Remaining Contractual Term Share Based Compensation Arrangement By Sharebased Payment Award Options Granted Weighted Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Exercise price, beginning Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Exercise price, granted Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Exercise price, exercised Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Exercise price, cancelled or expired Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Exercise price, ending Aggregate intrinsic value outstanding, beginning balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Aggregate intrinsic value, exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Aggregate intrinsic value outstanding, ending balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract] Vested and expected to vest in the future, Number of options Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Vested and expected to vest in the future, Remaining contractual term Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Vested and expected to vest in the future, Exercise price Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Vested and expected to vest in the future, Aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Exercisable, Number of options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Exercisable, Remaining contractual term Exercisable, Exercise price Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Exercisable, Aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Net Sales Business Acquisition, Pro Forma Revenue Net Income Business Acquisition, Pro Forma Net Income (Loss) Net earnings per share - basic (usd per share) Business Acquisition, Pro Forma Earnings Per Share, Basic Net earnings per share - diluted (usd per share) Business Acquisition, Pro Forma Earnings Per Share, Diluted Stock compensation expense Allocated Share-based Compensation Expense, Net of Tax ASSETS Assets [Abstract] Current Assets Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Investments - certificates of deposit Certificates of Deposit, at Carrying Value Customer receivables, net Inventories Income taxes receivable Income Taxes Receivable, Current Prepaid expenses and other Prepaid Expense and Other Assets, Current Total Current Assets Assets, Current Property, plant and equipment, net Investments - certificates of deposit Certificates of Deposit, Noncurrent Certificates of Deposit, Noncurrent Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Customer relationships [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Intangibles, net Finite-Lived Intangible Assets, Net Promotional displays, net Promotional Displays Net Promotional displays net Deferred income taxes Deferred Income Tax Assets, Net Other assets Other Assets, Noncurrent TOTAL ASSETS Assets LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity [Abstract] Current Liabilities Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Current maturities of long-term debt Accrued marketing expenses Accrued Marketing Costs, Current Other accrued expenses Other Accrued Liabilities, Current Total Current Liabilities Liabilities, Current Long-term debt, less current maturities Deferred income taxes Deferred Income Tax Liabilities, Net Defined benefit pension liabilities Liability, Defined Benefit Pension Plan, Noncurrent Other long-term liabilities Other Liabilities, Noncurrent Shareholders' Equity Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $1.00 par value; 2,000,000 shares authorized, none issued Preferred Stock, Value, Issued Common stock, no par value; 40,000,000 shares authorized; issued and outstanding shares: at April 30, 2018: 17,503,922, at April 30, 2017: 16,232,775 Common Stock, Value, Issued Accumulated other comprehensive loss - Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Defined benefit pension plans Total Shareholders' Equity Stockholders' Equity Attributable to Parent TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity Tax Credit Carryforward [Table] Tax Credit Carryforward [Table] Tax Credit Carryforward [Axis] Tax Credit Carryforward [Axis] Tax Credit Carryforward, Name [Domain] Tax Credit Carryforward, Name [Domain] Investment Tax Credit Carryforward [Member] Investment Tax Credit Carryforward [Member] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] State [Member] State and Local Jurisdiction [Member] Other Liabilities [Member] Other Liabilities [Member] Tax Credit Carryforward [Line Items] Tax Credit Carryforward [Line Items] Provisional expense Tax Cuts And Jobs Act Of 2017, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense Tax Cuts And Jobs Act Of 2017, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense Decrease in valuation allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Gross amount of state tax credit carryforwards Tax Credit Carryforward, Amount Net deferred tax assets related to tax credit carryforwards Deferred Tax Assets, Tax Credit Carryforwards, Net Deferred Tax Assets, Tax Credit Carryforwards, Net Schedule Of Quarterly Financial Information Quarterly Financial Information [Table Text Block] Other comprehensive income (loss) Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Customer Receivables Loans, Notes, Trade and Other Receivables Disclosure [Text Block] CURRENT EXPENSE Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Current Federal Tax Expense (Benefit) State Current State and Local Tax Expense (Benefit) Foreign Current Foreign Tax Expense (Benefit) Total current expense Current Income Tax Expense (Benefit) DEFERRED EXPENSE Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Deferred Federal Income Tax Expense (Benefit) State Deferred State and Local Income Tax Expense (Benefit) Deferred Foreign Income Tax Expense (Benefit) Deferred Foreign Income Tax Expense (Benefit) Total deferred expense Deferred Income Tax Expense (Benefit) Total expense Total comprehensive income tax expense Other Comprehensive Income (Loss), Tax Property, Plant and Equipment Property, Plant and Equipment Disclosure [Text Block] Schedule Of Income Tax Expense Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule Of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule Of Significant Components Of Deferred Tax Assets And Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Income Taxes Income Tax Disclosure [Text Block] Movement in Standard Product Warranty Accrual [Roll Forward] Movement in Standard Product Warranty Accrual [Roll Forward] Beginning balance Standard Product Warranty Accrual Acquisition Standard Product Warranty Accrual, Additions from Business Acquisition Accrual for warranties Standard Product Warranty Accrual, Increase for Warranties Issued Settlements Standard Product Warranty Accrual, Decrease for Payments Ending balance at fiscal year end Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Asset Class [Axis] Asset Class [Axis] Fair Value by Asset Class [Domain] Asset Class [Domain] Money Market Funds [Member] Money Market Funds [Member] Mutual Funds [Member] Mutual Funds [Member] Mutual Funds [Member] Certificates of Deposit [Member] Certificates of Deposit [Member] LEVEL 1 [Member] Fair Value, Inputs, Level 1 [Member] LEVEL 3 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Total assets at fair value Assets, Fair Value Disclosure Inventories Inventory Disclosure [Text Block] Cash and Cash Equivalents [Member] Defined Benefit Plan, Cash and Cash Equivalents [Member] Mutual Fund Equity [Member] Mutual Fund Equity [Member] Mutual Fund Equity [Member] International Equity [Member] International Equity [Member] International Equity [Member] Fixed Income Funds [Member] Fixed Income Funds [Member] Mutual Fund Income Tax [Member] Mutual Fund Income Tax [Member] Mutual Fund Income Tax [Member] Capital Preservation Fund [Member] Capital Preservation Fund [Member] Capital Preservation Fund [Member] QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) [Member] SIGNIFICANT OBSERVABLE INPUTS (LEVEL 2) [Member] SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) [Member] Plan assets at net asset value Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets Plan investment assets, at fair value Reconciliation Of Benefit Obligations, Plan Assets, And Funded Status Schedule Of Postretirement Benefit Obligations Plan Assets And Funded Status [Table Text Block] Schedule Of Postretirement Benefit Obligations Plan Assets And Funded Status Net Periodic Pension Cost Schedule of Net Benefit Costs [Table Text Block] Schedule Of Assumptions Used To Determine Benenfit Obligations And Earnings Effects For Pension Plans Schedule of Assumptions Used [Table Text Block] Schedule Of Expected Future Benefit Payments Schedule of Expected Benefit Payments [Table Text Block] Schedule Of Pension Assets By Major Category Of Plan Assets And Type Of Fair Value Measurements Schedule of Pension Assets By Major Category Of Plan Assets And Type of Fair Value Measurement [Table Text Block] Schedule of Pension Assets By Major Category Of Plan Assets And Type of Fair Value Measurement Schedule Of Allocation Of Plan Assets Schedule of Allocation of Plan Assets [Table Text Block] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common Stock [Member] Retained Earnings [Member] Retained Earnings [Member] Accumulated Other Comprehensive Loss [Member] AOCI Attributable to Parent [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning Balance, Shares Beginning Balance Other comprehensive loss, net of tax Other Comprehensive Income (Loss), Net of Tax Stock-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Stock Options, Requisite Service Period Recognition Adjustments to excess tax benefit from stock-based compensation Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation Exercise of stock-based compensation awards, net of amounts withheld for taxes, shares Exercise of stock-based compensation awards, net of amounts withheld for taxes Stock Issued During Period, Value, Stock Options Exercised Stock issuance related to acquisition, shares Stock Issued During Period, Shares, Acquisitions Stock issuance related to acquisition Stock Issued During Period, Value, Acquisitions Stock repurchases, shares Stock Repurchased and Retired During Period, Shares Stock repurchases Stock Repurchased and Retired During Period, Value Employee benefit plan contributions, shares Stock Issued During Period, Shares, Employee Benefit Plan Employee benefit plan contributions Stock Issued During Period, Value, Employee Benefit Plan Adoption of ASU 2018-02 Cumulative Effect of New Accounting Principle in Period of Adoption Ending Balance, Shares Ending Balance Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Recognized net actuarial loss Defined Benefit Plan Recognized Net Actuarial Gain Loss Defined Benefit Plan Recognized Net Actuarial Gain Loss Pension benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 2018 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2019 Operating Leases, Future Minimum Payments, Due in Two Years 2020 Operating Leases, Future Minimum Payments, Due in Three Years 2021 Operating Leases, Future Minimum Payments, Due in Four Years 2022 Operating Leases, Future Minimum Payments, Due in Five Years 2023 (and thereafter) Operating Leases, Future Minimum Payments, Due Thereafter Total, Operating Operating Leases, Future Minimum Payments Due Capital Leases, Future Minimum Payments, Net Present Value [Abstract] Capital Leases, Future Minimum Payments, Net Present Value [Abstract] 2018 Capital Leases, Future Minimum Payments Due, Next Twelve Months 2019 Capital Leases, Future Minimum Payments Due in Two Years 2020 Capital Leases, Future Minimum Payments Due in Three Years 2021 Capital Leases, Future Minimum Payments Due in Four Years 2022 Capital Leases, Future Minimum Payments Due in Five Years 2023 (and thereafter) Capital Leases, Future Minimum Payments Due Thereafter Total, Capital Capital Leases, Future Minimum Payments Due Less amounts representing interest (2%) Capital Leases, Future Minimum Payments, Interest Included in Payments Total obligations under capital leases Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments Schedule of Capital Leased Assets [Table] Schedule of Capital Leased Assets [Table] Capital Leased Assets [Line Items] Capital Leased Assets [Line Items] Capital leases, interest rate, effective percentage Capital Leases of Lessee, Contingent Rentals, Interest Rate, Effective Percentage Capital Leases of Lessee, Contingent Rentals, Interest Rate, Effective Percentage Pension Plan, Defined Benefit [Member] Pension Plan [Member] Discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Expected return on plan assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets Fair Value Measurements Fair Value Disclosures [Text Block] Schedule II - Valuation and Qualifying Accounts SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Deferred tax assets: Deferred Tax Assets, Gross [Abstract] Pension benefits Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions Accounts receivable Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts Product liability Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Warranty Reserves Employee benefits Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits State tax credit carryforwards Deferred Tax Assets, Tax Credit Carryforwards Other Deferred Tax Assets, Other Gross deferred tax assets, before valuation allowance Deferred Tax Assets, Gross Valuation allowance Deferred Tax Assets, Valuation Allowance Gross deferred tax assets, after valuation allowance Deferred Tax Assets, Net of Valuation Allowance Deferred tax liabilities: Deferred Tax Liabilities, Gross [Abstract] Pension benefits Deferred Tax Liabilities, Pension Benefits Deferred Tax Liabilities, Pension Benefits Inventory Deferred Tax Liabilities, Inventory Depreciation Deferred Tax Liabilities Deferred Expense Capitalized Depreciation Deferred Tax Liabilities Deferred Expense Capitalized Depreciation Intangibles Deferred Tax Liabilities, Intangible Assets Other Deferred Tax Liabilities, Other Total Deferred Tax Liabilities, Gross Net deferred tax liability Deferred Tax Liabilities, Net Net deferred tax asset Deferred Tax Assets, Net Fair Value Of Assets On Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Plan asset target allocation Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Change in Unrecognized Tax Benefits Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Balance at beginning of year Unrecognized Tax Benefits Reductions for tax positions of prior years Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Acquisitions, divestures, and other Unrecognized Tax Benefits, Increase Resulting from Acquisition Balance at end of year Statement of Cash Flows [Abstract] OPERATING ACTIVITIES Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash and cash equivalents provided by operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Net loss on disposal of property, plant and equipment Gain (Loss) on Disposition of Property Plant Equipment Gain on sales of assets held for sale Gain (Loss) on Sale of Properties Stock-based compensation expense Share-based Compensation Deferred income taxes Pension contributions in excess of expense Payment for Pension Benefits Excess tax benefit from stock-based compensation Excess Tax Benefit from Share-based Compensation, Operating Activities Contributions of employer stock to employee benefit plan Employee Benefit Plan, Stock Expense Employee Benefit Plan, Stock Expense Other non-cash items Other Noncash Income (Expense) Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Customer receivables Increase (Decrease) in Accounts Receivable Inventories Increase (Decrease) in Inventories Income taxes receivable Increase (Decrease) in Income Taxes Receivable Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable Increase (Decrease) in Accounts Payable Accrued compensation and related expenses Increase (Decrease) in Employee Related Liabilities Income taxes payable Increase (Decrease) in Income Taxes Payable Marketing and other accrued expenses Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Net Cash Provided by Operating Activities INVESTING ACTIVITIES Net Cash Provided by (Used in) Investing Activities [Abstract] Payments to acquire property, plant, and equipment Payments to Acquire Property, Plant, and Equipment Proceeds from sales of property, plant, and equipment Proceeds from Sale of Property, Plant, and Equipment Proceeds from sales of assets held for sale Purchases of certificates of deposit Payments to Acquire Short-term Investments Proceeds from Maturities, Prepayments and Calls of Short-term Investments Proceeds from Maturities, Prepayments and Calls of Short-term Investments Investment in promotional displays Payments to Acquire Other Productive Assets Net Cash Used by Investing Activities Net Cash Provided by (Used in) Investing Activities FINANCING ACTIVITIES Net Cash Provided by (Used in) Financing Activities [Abstract] Payments of long-term debt Repayments of Long-term Debt Proceeds from long-term debt Proceeds from Issuance of Long-term Debt Excess tax benefit from stock-based compensation Excess Tax Benefit from Share-based Compensation, Financing Activities Proceeds from issuance of common stock and other Proceeds from Issuance of Common Stock Repurchase of common stock Payments for Repurchase of Common Stock Withholding of employee taxes related to stock-based compensation Payments Related to Tax Withholding for Share-based Compensation Debt issuance cost Payments of Debt Issuance Costs Notes receivable, net Increase (Decrease) in Long-term Receivables, Current Net Cash Provided (Used) by Financing Activities Net Increase in Cash And Cash Equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash And Cash Equivalents, Beginning of Year Cash And Cash Equivalents, End of Year Non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Long-term debt related to funding acquisition Noncash or Part Noncash Acquisition, Debt Assumed Long-term debt issued to satisfy outstanding debt Notes Issued Long-term debt satisfied from issuance of debt Notes Reduction Stock issuance in connection with acquisition Stock Issued Property, plant and equipment Capital Expenditures Incurred but Not yet Paid Net other assets and liabilities related to acquisition Noncash or Part Noncash Acquisition, Other Liabilities Assumed Cash paid during the period for: Supplemental Cash Flow Information [Abstract] Interest Interest Paid, Including Capitalized Interest, Operating and Investing Activities Income taxes Income Taxes Paid