Accounts Receivable, Net [Abstract] Customer Receivables Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Income Statement [Abstract] Net sales Revenue, Net Cost of sales and distribution Cost of Goods and Services Sold Gross Profit Gross Profit Selling and marketing expenses Selling and Marketing Expense General and administrative expenses General and Administrative Expense Operating Income Operating Income (Loss) Interest expense Interest Expense Other income Other Nonoperating Income (Expense) Income Before Income Taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) Net Income Net Income (Loss) Attributable to Parent Weighted Average Shares Outstanding Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Net earnings per share Earnings Per Share [Abstract] Basic (in usd per share) Earnings Per Share, Basic Diluted (in usd per share) Earnings Per Share, Diluted Supplemental Cash Flow Information [Abstract] Cash paid during the period for interest Interest Paid Cash paid during the period for income taxes Income Taxes Paid Net income Denominator for basic net earnings per common share - weighted-average shares Effect of dilutive securities: Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Stock options and restricted stock units Weighted Average Number Diluted Shares Outstanding Adjustment Denominator for diluted net earnings per common share - weighted-average shares and assumed conversions Net earnings per share Earnings Per Share, Basic and Diluted [Abstract] Share-based Compensation [Abstract] Stock-Based Compensation Shareholders' Equity and Share-based Payments [Text Block] Commitments and Contingencies Disclosure [Abstract] Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table] Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Contingent Consideration by Type [Axis] Contingent Consideration by Type [Axis] Contingent Consideration Type [Domain] Contingent Consideration Type [Domain] Merger Agreement [Member] Merger Agreement [Member] Merger Agreement [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Alliance Merger Sub, Inc. [Member] RSI Home Products, Inc. and Alliance Merger Sub, Inc. [Member] RSI Home Products, Inc. and Alliance Merger Sub, Inc. [Member] Business Acquisition, Contingent Consideration [Line Items] Business Acquisition, Contingent Consideration [Line Items] Payments to Acquire Businesses, Net of Cash Acquired Payments to Acquire Businesses, Net of Cash Acquired Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Number of Shares Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Number of Shares Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Number of Shares Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Statement of Financial Position [Abstract] 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 Accounts Receivable, Net, Current Inventories Inventory, Net Prepaid expenses and other Prepaid Expense and Other Assets, Current Total Current Assets Assets, Current Property, plant and equipment, net Property, Plant and Equipment, Net Investments - certificates of deposit Certificates of Deposit, Noncurrent Certificates of Deposit, Noncurrent Promotional displays, net Promotional Displays Net Promotional displays net Deferred income taxes Deferred Tax Assets, Net of Valuation Allowance, Noncurrent 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 Long-term Debt, Current Maturities Accrued compensation and related expenses Employee-related Liabilities, Current 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 Long-term Debt and Capital Lease Obligations Defined benefit pension liabilities Defined Benefit Pension Plan, Liabilities, 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 October 31, 2016: 16,266,189; at April 30, 2016: 16,244,041 Common Stock, Value, Issued Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss - Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Defined benefit pension plans Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax Total Shareholders' Equity Stockholders' Equity Attributable to Parent TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity Pension and Other Postretirement Benefit Expense [Abstract] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Expected company contributions to pension plan Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year Expected company contributions to pension plan, discretionary funding Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year, Discretionary Funding Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year, Discretionary Funding Pension contribution Defined Benefit Plan, Contributions by Employer Basis Of Presentation [Abstract] Basis of presentation [Abstract]. Basis of Presentation Basis of Presentation and Significant Accounting Policies [Text Block] Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Interest cost Defined Benefit Plan, Interest Cost Expected return on plan assets Defined Benefit Plan, Expected Return on Plan Assets Recognized net actuarial loss Defined Benefit Plan, Amortization of Gains (Losses) Net periodic pension benefit Defined Benefit Plan, Net Periodic Benefit Cost Statement of Comprehensive Income [Abstract] Other comprehensive income, deferred tax Other Comprehensive Income (Loss), Tax Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Maximum [Member] Maximum [Member] Minimum [Member] Minimum [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] Debt Instrument [Line Items] Debt Instrument [Line Items] Ratio of total liabilities to tangible net worth Debt Instrument, Covenant, Liabilities To Net Worth Ratio Debt Instrument, Covenant, Liabilities to Net Worth Ratio Ratio of cash flow to fixed charges Debt Instrument, Covenant, Cash Flow To Fixed Charges Ratio Debt Instrument, Covenant, Cash Flow to Fixed Charges Ratio Proceeds from long-term debt Proceeds from Issuance of Long-term Debt Deferred finance costs Debt Issuance Costs, Net Pension Benefits Pension and Other Postretirement Benefits Disclosure [Text Block] Gross customer receivables Accounts Receivable, Gross, Current Less: Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract] 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 Preferred stock, par value (in usd per share) 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 (in usd per share) 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 Other Information Commitments and Contingencies Disclosure [Text Block] 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 Expenses [Member] Selling and Marketing Expense [Member] General and Administrative Expenses [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 Allocated Share-based Compensation Expense Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Document And Entity Information [Abstract] Document And Entity Information Abstract Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Filer Category Entity Filer Category Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Trading Symbol Trading Symbol Product Warranties Disclosures [Abstract] Product Warranty Product Warranty Disclosure [Text Block] Shares of its common stock repurchased Treasury Stock, Shares, Acquired Shares excluded from the calculation of net earnings per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Fair Value Disclosures [Abstract] Fair Value of Assets on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Inventory, Net [Abstract] Inventories Inventory Disclosure [Text Block] Cash Flow Cash Flow, Supplemental Disclosures [Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] Net Earnings Per Share Earnings Per Share [Text Block] Loans Payable and Long-Term Debt Debt Disclosure [Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Vesting [Axis] Vesting [Axis] Vesting [Domain] Vesting [Domain] Cliff Vest [Member] Cliff Vest [Member] Cliff Vest [Member] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Employee Service-Based RSUs [Member] Employee Service-Based Restricted Stock Units [Member] Employee Service-Based Restricted Stock Units [Member] Employee Performance-Based RSUs [Member] Employee Performance Based Restricted Stock Units [Member] Employee Performance Based Restricted Stock Units [Member] Employee and Non Employee Director Service-Based RSUs [Member] Employee And Non Employee Director Service Based Restricted Stock Units [Member] Employee And Non Employee Director Service Based Restricted Stock Units [Member] RSUs [Member] Restricted Stock Units (RSUs) [Member] Non-Employee Service-Based Restricted Stock Units [Member] Non-Employee Service-Based Restricted Stock Units [Member] Non-Employee Service-Based Restricted Stock Units [Member] Employee Performance-Based RSTUs [Member] Employee Performance Based Restricted Stock Tracking Units [Member] Employee Performance Based Restricted Stock Tracking Units [Member] Employee Service-Based RSTUs [Member] Employee Service Based Restricted Stock Tracking Units [Member] Employee Service Based Restricted Stock Tracking Units [Member] RSTUs [Member] Restricted Stock Tracking Units Rstu [Member] Restricted Stock Tracking Units RSTU [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Granted non-statutory stock options to key employees (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures Vesting period, years Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Awarded in period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Common stock issuable per RSU granted (in shares) Share-based Goods and Nonemployee Services Transaction, Shares Issuable Per Restricted Stock Unit Granted Share-based Goods and Nonemployee Services Transaction, Shares Issuable Per Restricted Stock Unit Granted Restricted stock units non vested grants (in shares) Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedGrantsInPeriod Liability for payment of the RSTUs Net income Other comprehensive income, net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Change in pension benefits, net of deferred taxes of $(156) and $(172), and $(312) and $(345), for the three and six months ended October 31, 2017 and 2016, respectively Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax Total Comprehensive Income Other Comprehensive Income (Loss), Net of Tax Accounting Changes and Error Corrections [Abstract] New Accounting Pronouncements New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] 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] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Level 2 [Member] Fair Value, Inputs, Level 2 [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, Recurring Components of Customer Receivables Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Schedule of Warranty Liability Schedule of Product Warranty Liability [Table Text Block] Components of Inventories Schedule of Inventory, Current [Table Text Block] Statement of Cash Flows [Abstract] Payments to Acquire Other Investments Payments to Acquire Other Investments OPERATING ACTIVITIES Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash 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 Stock-based compensation expense Share-based Compensation Deferred income taxes Deferred Income Tax Expense (Benefit) Pension contributions in excess of expense Pension Contributions In Excess Of Pension Expense Pension Contributions In Excess Of Pension Expense 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 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 Other accrued expenses Increase (Decrease) in Other Accrued Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) 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 Maturities, Prepayments and Calls of Other Investments Proceeds from Maturities, Prepayments and Calls of Other 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 issuance of common stock Proceeds from Issuance of Common Stock Repurchase of common stock Payments for Repurchase of Common Stock Notes receivable, net Proceeds from (Repayments of) Notes Receivable Proceeds from (Repayments of) Notes Receivable Withholding of employee taxes related to stock-based compensation Payments Related to Tax Withholding for Share-based Compensation Net cash used by financing activities Net Cash Provided by (Used in) Financing Activities Net decrease in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Raw materials Inventory, Raw Materials, Gross Work-in-process Inventory, Work in Process, Gross Finished goods Inventory, Finished Goods, Gross Total FIFO inventories FIFO Inventory Amount Reserve to adjust inventories to LIFO value Inventory, LIFO Reserve Total LIFO inventories LIFO Inventory Amount Supplemental Disclosures of Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Warranty claims period Product Warranty Claims, Period Product Warranty Claims, Period Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward] Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward] Beginning balance Standard and Extended Product Warranty Accrual Accrual Standard and Extended Product Warranty Accrual, Increase for Warranties Issued Settlements Standard and Extended Product Warranty Accrual, Decrease for Payments Ending balance Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Valuation allowance Tax Credit Carryforward, Valuation Allowance Excess tax benefit related to stock-based compensation Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount Net Periodic Pension (Benefit) Cost Schedule of Net Benefit Costs [Table Text Block] New Accounting Pronouncement, Early Adoption [Table] New Accounting Pronouncement, Early Adoption [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2016-09 [Member] Accounting Standards Update 2016-09 [Member] Accounting Standards Update 2016-09 [Member] Accounting Standards Update 2015-03 [Member] Accounting Standards Update 2015-03 [Member] New Accounting Pronouncement, Early Adoption [Axis] New Accounting Pronouncement, Early Adoption [Axis] New Accounting Principles, Early Adoption [Domain] New Accounting Principles, Early Adoption [Domain] New Accounting Pronouncement, Early Adoption, Effect [Member] New Accounting Pronouncement, Early Adoption, Effect [Member] New Accounting Pronouncement, Early Adoption [Line Items] New Accounting Pronouncement, Early Adoption [Line Items] Reclassification from operating activities Reclassification to financing activities Basic (in usd per share) Diluted (in usd per share) New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Long-term Debt [Member] Long-term Debt [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Reclassification of debt issuance costs Stock-Based Compensation Expense Allocated Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]