Income Tax Disclosure [Abstract] Reconciliation of Unrecognized Tax Benefits [Roll Forward] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Balance at beginning of period Unrecognized Tax Benefits Increases in positions taken in a prior period Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Decreases in positions taken in a prior period Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions New positions taken in a current period Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Decrease due to settlements Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Decrease due to lapse of statute of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Balance at end of period Allowance for doubtful accounts Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts Compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Long-Term Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Long-Term Inventory differences Deferred Tax Assets, Inventory Marketing accrual Deferred Tax Assets, Tax Deferred Expense, Marketing Reserves Deferred Tax Assets, Tax Deferred Expense, Marketing Reserves Stock-based compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Accrued post-retirement benefit obligations Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits Vacation accrual Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Compensated Absences Warranty accrual Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Net operating loss carryforward Deferred Tax Assets, Operating Loss Carryforwards Charitable contributions carryforward Deferred Tax Assets, Charitable Contribution Carryforwards Other – net Deferred Tax Assets, Other, Long-Term Deferred Tax Assets, Other, Long-Term Total deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Deferred income Deferred Tax Liabilities, Tax Deferred Income Goodwill and other intangible assets Deferred Tax Liabilities, Goodwill and Intangible Assets Prepaids Deferred Tax Liabilities, Prepaid Expenses Tax over book depreciation Deferred Tax Liabilities, Property, Plant and Equipment Total deferred tax liabilities Deferred Tax Liabilities, Gross Valuation allowance Deferred Tax Liabilities, Valuation Allowance Deferred Tax Liabilities, Valuation Allowance Total net deferred tax liabilities Deferred Tax Liabilities, Net Long-term net deferred tax assets Deferred Income Tax Assets, Net Long-term net deferred tax liabilities Deferred Income Tax Liabilities, Net Retirement Benefits [Abstract] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Postretirement Health Coverage Postretirement Health Coverage [Member] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Equity [Abstract] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassifications from accumulated other comprehensive income (loss) Reclassification out of Accumulated Other Comprehensive Income [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Derivative financial instruments Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest rate swap Interest Rate Swap [Member] Diesel hedge Diesel Hedge [Member] Diesel Hedge [Member] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Interest income or (expense) Interest Income (Expense), Net Selling and administrative expenses Selling, General and Administrative Expense Tax (expense) or benefit Income Tax Expense (Benefit) Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Accounting Policies [Abstract] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract] Number (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Weighted-Average Exercise Price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Weighted-Average Remaining Service Period (years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Aggregate Intrinsic Value ($000s) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Number (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Weighted-Average Exercise Price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price Weighted-Average Remaining Service Period (years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Aggregate Intrinsic Value ($000s) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Supplemental Cash Flow Elements [Abstract] Schedule of Cash Flow, Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] General, auto, product, and workers' compensation liabilities Self Insurance Reserve Percentage of LIFO inventory Percentage of LIFO Inventory Inventory, Net [Abstract] Inventory, Net [Abstract] Finished products Inventory, Finished Goods, Gross Materials and work in process Inventory, Work in Process and Raw Materials LIFO allowance Inventory, LIFO Reserve Inventories, net Inventory, Net Effect of LIFO inventory, decrease (increase) in cost of goods sold Effect of LIFO Inventory Liquidation on Income Freight expense Freight Costs Segment Reporting [Abstract] Number of business segments Number of Reportable Segments Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Operating Segments [Member] General corporate Corporate, Non-Segment [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Office Furniture Office Furniture [Member] Office Furniture [Member]. Hearth Products Hearth Products [Member] Hearth Products [Member]. Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Net sales Revenue, Net Operating profit Segment Reporting Information Operating Profit Loss Segment Reporting Information, Operating Profit (Loss). General corporate Segment Reporting Information Unallocated Corporate Expense Segment Reporting Information Unallocated Corporate Expense. Total Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Depreciation and amortization expense Depreciation, Depletion and Amortization Capital expenditures (including capitalized software) Payments to Acquire Productive Assets Identifiable assets Assets Restructuring and impairment charges Restructuring, Settlement and Impairment Provisions Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Revolving credit facility with interest at a variable rate (2017 - 2.7%; 2016 - 1.8%) Notes Payable to Banks [Member] Other amounts Other Notes and Amounts [Member] Other Notes and Amounts [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Total debt Long-term Debt Less: Current maturities of long-term debt Long-term Debt, Current Maturities Long-term debt Long-term Debt, Excluding Current Maturities Effective interest rate Debt Instrument, Interest Rate, Effective Percentage Fiscal 2018 Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months Fiscal 2019 Defined Benefit Plan, Expected Future Benefit Payment, Year Two Fiscal 2020 Defined Benefit Plan, Expected Future Benefit Payment, Year Three Fiscal 2021 Defined Benefit Plan, Expected Future Benefit Payment, Year Four Fiscal 2022 Defined Benefit Plan, Expected Future Benefit Payment, Year Five Fiscal 2023 – 2027 Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter Expected Contributions During Fiscal 2018 Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year Leases [Abstract] Operating Leases Lessee, Operating Lease, Disclosure [Table Text Block] Retirement Benefits Postemployment Benefits Disclosure [Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Goodwill [Line Items] Goodwill [Line Items] Goodwill [Roll Forward] Goodwill [Roll Forward] Goodwill, gross beginning balance Goodwill, Gross Accumulated impairment losses, beginning balance Goodwill, Impaired, Accumulated Impairment Loss Goodwill, net beginning balance Goodwill Goodwill acquired during the year Goodwill, Acquired During Period Impairment losses Goodwill, Impairment Loss Foreign currency translation adjustment Goodwill, Foreign Currency Translation Gain (Loss) Goodwill, gross ending balance Accumulated impairment losses, ending balance Goodwill, net ending balance Restructuring and Related Activities [Abstract] Restructuring and Related Costs Restructuring and Related Costs [Table Text Block] Schedule of Restructuring Reserve by Type of Cost Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Fiscal Year-end Fiscal Period, Policy [Policy Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Cash, Cash Equivalents and Investments Cash, Cash Equivalents and Investments Policy [Policy Text Block] Cash, Cash Equivalents and Investments Policy [Policy Text Block] Receivables Receivables, Policy [Policy Text Block] Inventories Inventory, Policy [Policy Text Block] Property, Plant and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Goodwill and Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Product Warranties Standard Product Warranty, Policy [Policy Text Block] Revenue Recognition Revenue Recognition, Policy [Policy Text Block] Product Development Costs Research and Development Expense, Policy [Policy Text Block] Freight Expense Shipping and Handling Cost, Policy [Policy Text Block] Stock-Based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Self-Insurance Self Insurance Reserve [Policy Text Block] Foreign Currency Translations Foreign Currency Transactions and Translations Policy [Policy Text Block] Reclassifications Reclassification, Policy [Policy Text Block] Recently Adopted Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Fair Value Measurements of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Schedule of Compensation Costs Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] Schedule of Valuation Assumptions Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Share-based Compensation, Stock Options, Activity Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Nonvested Restricted Stock Units Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Stock Option Vested or Expected to Vest and are Exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block] Schedule of Share-based Compensation Arrangement Other Information Schedule of Share-based Compensation Arrangement Other Information [Table Text Block] Schedule of Share-based Compensation Arrangement Other Information [Table Text Block] Schedule of Share-based Compensation, Restricted Stock Units Activity Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Revenue from External Customers by Products and Services [Table] Revenue from External Customers by Products and Services [Table] Products and Services [Axis] Products and Services [Axis] Products and Services [Domain] Products and Services [Domain] Systems and storage Systems and Storage Products [Member] Systems and Storage Products [Member] Seating Seating Products [Member] Seating Products [Member] Other Other Product Category [Member] Other Product Category [Member] Revenue from External Customer [Line Items] Revenue from External Customer [Line Items] Total fair value of shares vested Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value Total intrinsic value of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Cash received from exercise of stock options Proceeds from Stock Options Exercised Tax benefit realized from exercise of stock options Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options Weighted-average grant-date fair value of option granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Stock contribution Defined Contribution Plan, Stock Contributions by Employer Defined Contribution Plan, Stock Contributions by Employer Other contribution Defined Contribution Plan, Employer Discretionary Contribution Amount Total annual contribution Defined Contribution Plan, Cost Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Common Stock Common Stock [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Retained Earnings Retained Earnings [Member] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Non-controlling Interest Noncontrolling Interest [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Comprehensive income: Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Net income (loss) Other comprehensive income (loss) (net of tax) Other Comprehensive Income (Loss), Net of Tax Change in ownership of non-controlling interest Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Cash dividends Dividends, Common Stock, Cash Common shares – treasury: Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract] Shares purchased Treasury Stock, Value, Acquired, Par Value Method Shares issued under Members’ Stock Purchase Plan and stock awards, net of tax Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Ending Balance Product development costs Research and Development Expense Interest, penalties, and (benefits) Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Liability related to unrecognized tax benefits Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 2018 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2019 Long-term Debt, Maturities, Repayments of Principal in Year Two 2020 Long-term Debt, Maturities, Repayments of Principal in Year Three 2021 Long-term Debt, Maturities, Repayments of Principal in Year Four 2022 Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five 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 improvements Land Improvements [Member] Buildings Building [Member] Machinery and equipment Machinery and Equipment [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Useful life Property, Plant and Equipment, Useful Life Depreciation expense Depreciation Commitments and Contingencies Disclosure [Abstract] Guarantees, Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Change in benefit obligation Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Benefit obligation at beginning of year Defined Benefit Plan, Benefit Obligation Service cost Defined Benefit Plan, Service Cost Interest cost Defined Benefit Plan, Interest Cost Benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid Actuarial (gain) loss Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Benefit obligation at end of year Change in plan assets Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Fair value at beginning of year Defined Benefit Plan, Fair Value of Plan Assets Actual return on assets Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Employer contribution Defined Benefit Plan, Plan Assets, Contributions by Employer Transferred out Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan Benefits paid Defined Benefit Plan, Plan Assets, Benefits Paid Fair value at end of year Funded Status of Plan Defined Benefit Plan, Funded (Unfunded) Status of Plan Amounts recognized in the Statement of Financial Position consist of: Liability, Defined Benefit Plan [Abstract] Current liabilities Liability, Defined Benefit Plan, Current Non-current liabilities Liability, Defined Benefit Plan, Noncurrent Amounts recognized in Accumulated Other Comprehensive Income (before tax) consist of: Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] Actuarial (gain) loss Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax Total Amount recognized in Accumulated Other Comprehensive Income (before tax) Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax Change in Accumulated Other Comprehensive Income (before tax): Change in Accumulated Other Comprehensive Income, Before tax [Roll Forward] Change in Accumulated Other Comprehensive Income, Before tax [Roll Forward] Amount disclosed at beginning of year Actuarial (gain) loss Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax Amortization of transition amount Other Comprehensive Income (Loss), Defined Benefit Plan, Transition Asset (Obligation), Reclassification Adjustment from AOCI, before Tax Amount disclosed at end of year Schedule of Long-Term Debt Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Maturities of Long-term Debt Schedule of Maturities of Long-term Debt [Table Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements of Financial Instruments Fair Value Disclosures [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] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Plan The Plan [Member] The Plan [Member] Vesting [Axis] Vesting [Axis] Vesting [Domain] Vesting [Domain] Cliff vesting Cliff Vesting [Member] Cliff Vesting [Member] Award Type [Axis] Equity Award [Domain] Non-vested Stock Options Nonvested Awards [Member] RSUs Restricted Stock Units (RSUs) [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Shares available for future issuance (shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Vesting period (years) Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Exercised period (years) Share-based Compensation Arrangement by Share-based Payment Award, Award Expiration Period Share-based Compensation Arrangement by Share-based Payment Award, Award Expiration Period Expected term Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Unrecognized compensation cost Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Nonvested stock, weighted average recognition period Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Total value of shares vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Deferred compensation Deferred Compensation Liability, Current and Noncurrent Current maturities of other long-term obligations Deferred Compensation Liability, Current Other long-term liabilities Deferred Compensation Liability, Classified, Noncurrent Total fair-market value of deferred compensation Deferred Compensation Liability, Fair Value Based on Common Stock Deferred Compensation Liability, Fair Value Based on Common Stock 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] Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract] Outstanding, Beginning Balance (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercised (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Forfeited or Expired (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Outstanding, Ending Balance (shares) Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Outstanding, Beginning Balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Forfeited or Expired (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Outstanding, Ending Balance (in dollars per share) Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Purchase Plan Purchase Plan [Member] Purchase Plan [Member] Class of Stock [Line Items] Class of Stock [Line Items] Common stock issued (shares) Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period Common stock issued at average price (in dollars per share) Common Stock Issued at Average Price Common Stock Issued at Average Price Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis Table Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Long-Term Debt Debt Disclosure [Text Block] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Revolving commitment Revolving Credit Facility [Member] Debt issuance costs, current Debt Issuance Costs, Current, Net Debt issuance costs, noncurrent Debt Issuance Costs, Noncurrent, Net Outstanding revolving credit facility Long-term Line of Credit Maximum line of credit facility borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Long-term revolving credit facility Long-term Line of Credit, Noncurrent Current revolving credit facility Line of Credit, Current Interest coverage ratio Debt Instrument, Covenant, Ratio of Interest Coverage to Earnings for the Last Four Fiscal Quarters Debt Instrument, Covenant, Ratio of Interest Coverage to Earnings for the Last Four Fiscal Quarters Consolidated leverage ratio Debt Instrument, Covenant, Ratio of Leverage to Earnings for the Last Four Fiscal Quarters Debt Instrument, Covenant, Ratio of Leverage to Earnings for the Last Four Fiscal Quarters Restructuring Related and Impairment Charges Restructuring and Related Activities Disclosure [Text Block] Award Type [Axis] Equity Award [Domain] 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] Outstanding, Beginning Balance (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Outstanding, Ending Balance (shares) Outstanding, Beginning Balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Outstanding, Ending Balance (in dollars per share) Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves [Domain] Valuation Allowances and Reserves [Domain] Valuation Allowance of Deferred Tax Assets Valuation Allowance of Deferred Tax Assets [Member] Operating Loss Carryforwards by Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] U.S. state State and Local Jurisdiction [Member] Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Line Items] Federal rate adjustment to deferred taxes Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit) Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit) Deferred tax benefit, remeasurement of deferred tax assets and liabilities Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Provisional Income Tax Expense (Benefit) Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Provisional Income Tax Expense (Benefit) Transition tax Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Transition Tax For Accumulated Foreign Earnings, Provisional Income Tax Expense Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Transition Tax For Accumulated Foreign Earnings, Provisional Income Tax Expense Tax cuts and jobs act of 2017, other legislation changes Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Other Legislation Changes, Provisional Income Tax Expense Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Other Legislation Changes, Provisional Income Tax Expense Valuation allowances and reserves increase Valuation Allowances and Reserves, Additions for Charges to Cost and Expense Operating loss carryforwards Operating Loss Carryforwards Tax credit carryforward, amount Tax Credit Carryforward, Amount Unrecognized tax benefits that would impact effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Undistributed earnings of foreign subsidiaries Undistributed Earnings of Foreign Subsidiaries Income tax on repatriation of foreign earnings Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount Tax credit carryforward expiration period Tax Credit Carryforward, Expiration Period Tax Credit Carryforward, Expiration Period Statement of Cash Flows [Abstract] Net Cash Flows From (To) Operating Activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Non-cash items included in net income: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Other post-retirement and post-employment benefits Pension and Other Postretirement Benefits Cost (Reversal of Cost) Stock-based compensation Share-based Compensation Excess tax benefits from stock-based compensation Excess Tax Benefit from Share-based Compensation, Operating Activities Deferred income taxes Deferred Income Taxes and Tax Credits (Gain) loss on sale, retirement, license, and impairment of long-lived assets and intangibles, net Net Loss On Sales Retirements And Impairments of Long Lived Assets And Intangibles Net Loss on Sales, Retirements and Impairments of Long-Lived Assets and Intangibles Other – net Other Noncash Income (Expense) Net increase (decrease) in operating assets and liabilities, net of acquisitions and divestitures Increase (Decrease) in Operating Capital Increase (decrease) in other liabilities Increase (Decrease) in Other Operating Liabilities Net cash flows from (to) operating activities Net Cash Provided by (Used in) Operating Activities Net Cash Flows From (To) Investing Activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Capital expenditures Payments to Acquire Property, Plant, and Equipment Proceeds from sale and license of property, plant, equipment, and intangibles Proceeds from Sale of Property, Plant, and Equipment Capitalized software Payments to Acquire Software Acquisition spending, net of cash acquired Payments to Acquire Businesses and Interest in Affiliates Purchase of investments Payments to Acquire Investments Sales or maturities of investments Proceeds from Sale and Maturity of Other Investments Other – net Payments for (Proceeds from) Other Investing Activities Net cash flows from (to) investing activities Net Cash Provided by (Used in) Investing Activities Net Cash Flows From (To) Financing Activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Payments of note and long-term debt and other financing Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities Proceeds from sales of HNI Corporation common stock Proceeds from Issuance of Long-term Debt Dividends paid Payments of Dividends Purchase of HNI Corporation common stock Payments for Repurchase of Common Stock Proceeds from sales of HNI Corporation common stock Proceeds from Issuance of Common Stock Withholding related to net share settlements of equity based awards Payments Related to Tax Withholding for Share-based Compensation Excess tax benefits from stock-based compensation Excess Tax Benefit from Share-based Compensation, Financing Activities Net cash flows from (to) financing activities Net Cash Provided by (Used in) Financing Activities Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of year Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of year Cash dividends per share (dollars per share) Common Stock, Dividends, Per Share, Cash Paid Statement of Financial Position [Abstract] Assets Assets [Abstract] Current Assets: Assets, Current [Abstract] Cash and cash equivalents Short-term investments Short-term Investments Receivables Accounts Receivable, Net, Current Inventories Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Total Current Assets Assets, Current Property, Plant, and Equipment: Property, Plant and Equipment, Net [Abstract] Land and land improvements Land and Land Improvements Buildings Buildings and Improvements, Gross Machinery and equipment Machinery and Equipment, Gross Construction in progress Construction in Progress, Gross Property, Plant, and Equipment Property, Plant and Equipment, Gross Less accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Net Property, Plant, and Equipment Property, Plant and Equipment, Net Goodwill and Other Intangible Assets Intangible Assets, Net (Including Goodwill) Deferred Income Taxes Other Assets Other Assets, Noncurrent Total Assets Liabilities and Equity Liabilities and Equity [Abstract] Current Liabilities: Liabilities, Current [Abstract] Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities, Current Current maturities of long-term debt Long-term Debt and Capital Lease Obligations, Current Current maturities of other long-term obligations Other Liabilities, Current Total Current Liabilities Liabilities, Current Long-Term Debt Other Long-Term Liabilities Other Liabilities, Noncurrent Deferred Income Taxes Equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] HNI Corporation shareholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock - $1 par value, authorized 2,000 shares, no shares outstanding Preferred Stock, Value, Outstanding Common stock Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Total HNI Corporation shareholders’ equity Stockholders' Equity Attributable to Parent Non-controlling interest Stockholders' Equity Attributable to Noncontrolling Interest Total Equity Total Liabilities and Equity Liabilities and Equity Service cost Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax Interest cost Defined Benefit Plan, Interest Cost In Year One Defined Benefit Plan, Interest Cost In Year One Amortization of net (gain) loss Defined Benefit Plan, Amortization of Gains (Losses) In Year One Defined Benefit Plan, Amortization of Gains (Losses) In Year One Net periodic post-retirement benefit cost (income) Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Restructuring Cost and Reserve [Axis] Restructuring Type [Axis] Type of Restructuring [Domain] Type of Restructuring [Domain] Severance Costs Employee Severance [Member] Facility Exit Costs & Other Facility Termination and Other Costs [Member] Facility Termination and Other Costs [Member] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Restructuring reserve at beginning of period Restructuring Reserve Restructuring charges Restructuring Charges Cash payments Payments for Restructuring Restructuring reserve at end of period Schedule of Indefinite-Lived Intangible Assets [Table] Schedule of Indefinite-Lived Intangible Assets [Table] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Trademarks and trade names Trademarks and Trade Names [Member] Indefinite-lived Intangible Assets [Line Items] Indefinite-lived Intangible Assets [Line Items] Indefinite-lived intangible assets Indefinite-Lived Intangible Assets (Excluding Goodwill) Income Statement [Abstract] Cost of sales Cost of Goods and Services Sold Gross profit Gross Profit Selling and administrative expenses (Gain) loss on sale, disposal, and license of assets Gain (Loss) on Disposition of Assets Operating income Operating Income (Loss) Interest income Investment Income, Interest Interest expense Interest Expense Income tax expense (benefit) Less: Net income (loss) attributable to the non-controlling interest Net Income (Loss) Attributable to Noncontrolling Interest Net income attributable to HNI Corporation Net Income (Loss) Attributable to Parent Average number of common shares outstanding – basic (shares) Weighted Average Number of Shares Outstanding, Basic Net income attributable to HNI Corporation per common share – basic (in dollars per share) Earnings Per Share, Basic Average number of common shares outstanding - diluted (shares) Weighted Average Number of Shares Outstanding, Diluted Net income attributable to HNI Corporation per common share – diluted (in dollars per share) Earnings Per Share, Diluted Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Change in unrealized gains (losses) on marketable securities, net of tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Change in pension and post-retirement liability, net of tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Change in derivative financial instruments, net of tax Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax Other comprehensive income (loss), net of tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Less: Comprehensive income (loss) attributable to non-controlling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive income attributable to HNI Corporation Comprehensive Income (Loss), Net of Tax, Attributable to Parent Income Taxes Income Tax Disclosure [Text Block] Schedule of Guarantor Obligations [Table] Schedule of Guarantor Obligations [Table] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Financing instruments, insurance policies and payment obligations Standby Letters of Credit [Member] Trade letters of credit and bankers' acceptances Trade Letters Of Credit And Bankers Acceptances [Member] Trade Letters Of Credit And Bankers Acceptances [Member] Guarantor Obligations [Line Items] Guarantor Obligations [Line Items] Letters of credit Letters of Credit Outstanding, Amount Business Combinations [Abstract] Acquisitions and Divestitures Business Combination Disclosure [Text Block] Hearth manufacturing facility, held for sale Disposal Group, Including Discontinued Operation, Prepaid and Other Assets, Current Number of facilities closed Restructuring And Related Cost, Number Of Facilities Eliminated Restructuring And Related Cost, Number Of Facilities Eliminated Excess tax benefit Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount Value of shares vested Schedule of Investments [Table] Schedule of Investments [Table] Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Debt securities Debt Securities [Member] Cash and money market accounts Cash and Cash Equivalents [Member] Schedule of Investments [Line Items] Schedule of Investments [Line Items] Long-term investments Long-term Investments Amortized cost basis of debt securities Available-for-sale Securities, Amortized Cost Basis Supplemental Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Schedule of Intangible Assets and Goodwill Schedule of Intangible Assets and Goodwill [Table Text Block] Schedule of Goodwill Schedule of Goodwill [Table Text Block] Schedule of Finite-Lived Intangible Assets by Major Class Schedule of Finite-Lived Intangible Assets [Table Text Block] Finite-lived Intangible Assets Amortization Expense Finite-lived Intangible Assets Amortization Expense [Table Text Block] Schedule of Expected Amortization Expense Table Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Schedule of Indefinite-Lived Intangible Assets Schedule of Indefinite-Lived Intangible Assets [Table Text Block] 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 lists and other Customer Relationships [Member] Subsegments [Axis] Subsegments [Axis] Subsegment [Domain] Subsegments [Domain] Office furniture reporting unit one Reporting Unit One [Member] Reporting Unit One [Member] Office furniture reporting unit two Reporting Unit Two [Member] Reporting Unit Two [Member] Trademarks and trade names Trade Names [Member] Goodwill impairment Intangible assets impairment Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) Gain on sale and license of intangible assets Gain (Loss) on Disposition of Intangible Assets Discount rate utilized for each reporting unit with rates range (percent) Discount Rate Utilized for Each Reporting Unit with Rates Range Discount Rate Utilized for Each Reporting Unit with Rates Range Near term growth (percent) Near Term Growth Utilized for Each Reporting Unit with Rates Range Near Term Growth Utilized for Each Reporting Unit with Rates Range Terminal growth (percent) Terminal Growth Utilized for Each Reporting Unit with Rates Range Terminal Growth Utilized for Each Reporting Unit with Rates Range Goodwill Decrease in reporting unit due to 100 basis point increase in discount rate Goodwill, Impairment Loss, Effect of One Hundred Basis Point Increase in Discount Rate Goodwill, Impairment Loss, Effect of One Hundred Basis Point Increase in Discount Rate Decrease in reporting unit due to 100 basis point decrease in long-term growth rate Goodwill, Impairment Loss, Effect of One Hundred Basis Point Decrease in Long-term Growth Rate Goodwill, Impairment Loss, Effect of One Hundred Basis Point Decrease in Long-term Growth Rate Trade names, net value Current: 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) Current provision Current Income Tax Expense (Benefit) Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Deferred Federal Income Tax Expense (Benefit) State Deferred State and Local Income Tax Expense (Benefit) Foreign Deferred Foreign Income Tax Expense (Benefit) Deferred provision Deferred Income Tax Expense (Benefit) Total income tax expense Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized (shares) Preferred Stock, Shares Authorized Preferred stock, shares outstanding (shares) Preferred Stock, Shares Outstanding Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized (shares) Common Stock, Shares Authorized Common stock, shares outstanding (shares) Common Stock, Shares, Outstanding Schedule of Shareholders' Equity [Table] Schedule of Shareholders' Equity [Table] Schedule of Shareholders' Equity [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Director plan Director Plan [Member] Director Plan [Member] Title of Individual [Axis] Title of Individual [Axis] Relationship to Entity [Domain] Relationship to Entity [Domain] Certain officers Officer [Member] Corporation's Chairman, President and CEO Corporation's Chairman, President and CEO [Member] Corporation's Chairman, President and CEO [Member] Schedule of Shareholders' Equity [Line Items] Schedule of Shareholders' Equity [Line Items] Schedule of Shareholders' Equity [Line Items] Derivative notional amount Derivative, Notional Amount Fixed interest rate Derivative, Fixed Interest Rate Derivative asset Derivative Asset Available for future issuance (shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Rights to purchase stock, minimum working hours per week Rights to Purchase Stock, Minimum Working Hours per Week Rights to Purchase Stock, Minimum Working Hours per Week Rights to purchase stock, minimum working months per year Rights to Purchase Stock, Minimum Working Months per Year Rights to Purchase Stock, Minimum Working Months per Year Price of repurchased stock as percent of closing price on the exercise date Price of Repurchased Stock as Percent of Closing Price on the Exercise Date Price of Repurchased Stock as Percent of Closing Price on the Exercise Date Maximum amount fair value for purchase of common stock Maximum Amount Fair Value for Purchase of Common Stock Maximum Amount Fair Value for Purchase of Common Stock Change in control percentage Supplemental Unemployment Benefits, Change in Control, Change in Control Percentage Supplemental Unemployment Benefits, Change in Control, Change in Control Percentage Percent of board members Supplemental Unemployment Benefits, Change in Control, Percent of Board Members Threshold Not Recommended by Three Fourths of Incumbent Board Supplemental Unemployment Benefits, Change in Control, Percent of Board Members Threshold Not Recommended by Three Fourths of Incumbent Board Number of times annual salary Supplemental Unemployment Benefits, Change in Control, Percent of Supplemental Unemployment Benefits, Change in Control, Salary Multiplier Supplemental Unemployment Benefits, Change in Control, Salary Multiplier Term of employment agreement Supplemental Unemployment Benefits, Change in Control, Term of Employment Agreement Supplemental Unemployment Benefits, Change in Control, Term of Employment Agreement Stock repurchased during period Stock Repurchased During Period, Value Average price per share of shares repurchased during period (in dollars per share) Shares Repurchased During Period, Average Price Per Share Shares Repurchased During Period, Average Price Per Share Stock repurchased during period (shares) Stock Repurchased During Period, Shares Accrued shares repurchased, not yet settled Accounts Payable And Accrued Liabilities, Shares Repurchased, Not Yet Settled Accounts Payable And Accrued Liabilities, Shares Repurchased, Not Yet Settled Remaining authorized repurchase amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) Foreign Currency Translation Adjustment Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Unrealized Gains (Losses) on Marketable Securities Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Pension and Post-retirement Liabilities Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Derivative Financial Instruments Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Other comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, before Tax Tax (expense) or benefit Other Comprehensive Income (Loss), Tax Amounts reclassified from accumulated other comprehensive income, net of tax Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Stock-based compensation expense Allocated Share-based Compensation Expense Schedule of Finite-Lived Intangible Assets by Major Class [Table] Schedule of Finite-Lived Intangible Assets [Table] Patents Patents [Member] Software Computer Software, Intangible Asset [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Net definite lived intangible assets Finite-Lived Intangible Assets, Net [Abstract] Gross Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Net Finite-Lived Intangible Assets, Net Capitalized software Capitalized Computer Software, Amortization Other definite-lived intangibles Amortization of Intangible Assets Amortization expense Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] 2018 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Five Post-Retirement Health Care Pension and Other Postretirement Benefits Disclosure [Text Block] Cash paid for: Supplemental Cash Flow Information [Abstract] Interest paid, net of capitalized interest Interest Paid Income taxes paid Income Taxes Paid Changes in accrued expenses due to: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Purchases of property and equipment Non-cash Transaction, Accrued Purchases of Property, Plant and Equipment Non-cash Transaction, Accrued Purchases of Property, Plant and Equipment Purchases of capitalized software Non-cash Transaction, Capitalized Computer Software Non-cash Transaction, Capitalized Computer Software Leases Leases of Lessee Disclosure [Text Block] Valuation and Qualifying Accounts Disclosure [Table] Valuation and Qualifying Accounts Disclosure [Table] Valuation and Qualifying Accounts Disclosure [Line Items] Valuation and Qualifying Accounts Disclosure [Line Items] Movement in Valuation Allowances and Reserves [Roll Forward] Movement in Valuation Allowances and Reserves [Roll Forward] Balance at beginning of period Valuation Allowances and Reserves, Balance Charged to expenses Adjustments to balance sheet Valuation Allowances and Reserves, Deductions Balance at end of period Valuation Allowance [Table] Valuation Allowance [Table] Allowance for doubtful accounts Allowance for Doubtful Accounts [Member] Valuation Allowance [Line Items] Valuation Allowance [Line Items] Balance at beginning of period Adjustments to Allowance Valuation Allowances and Reserves, Additions for Adjustments Amounts written off, net of recoveries and other adjustments Divestitures Valuation Allowances and Reserves, Divestitures Valuation Allowances and Reserves, Divestitures Business Segment Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Net Sales by Product Category Revenue from External Customers by Products and Services [Table Text Block] Components of Net Periodic Postretirement Benefit Cost Schedule of Defined Benefit Plans Disclosures [Table Text Block] Schedule of Expected Benefit Payments Schedule of Expected Benefit Payments [Table Text Block] Schedule of Expected Contributions Defined Benefit Plan, Schedule Of Expected Contributions [Table Text Block] Defined Benefit Plan, Schedule Of Expected Contributions [Table Text Block] Schedule of Assumptions Used Schedule of Assumptions Used [Table Text Block] Schedule of Net Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Accumulated Other Comprehensive Income (Loss) and Shareholders' Equity Stockholders' Equity Note Disclosure [Text Block] Schedule of Components of Income Tax Expense (Benefit) 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 Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Summary of Valuation Allowance Summary of Valuation Allowance [Table Text Block] Summary of Income Tax Contingencies Summary of Income Tax Contingencies [Table Text Block] Schedule Of Interest And Penalties On Income Taxes Schedule Of Interest And Penalties On Income Taxes [Table Text Block] Schedule Of Interest And Penalties On Income Taxes [Table Text Block] Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Goodwill Definite-lived intangible assets Intangible assets, net (including goodwill) Federal statutory tax expense Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount State taxes, net of federal tax effect Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Credit for increasing research activities Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount Deduction related to domestic production activities Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Amount Valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Federal rate adjustment to deferred taxes Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Equity based compensation Change in uncertain tax positions Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Foreign income tax rate differential Income Tax Reconciliation, Foreign Income Tax Rate Differential Inlcuding Discontinued Operations and Noncontrolling Interest Income Tax Reconciliation, Foreign Income Tax Rate Differential Inlcuding Discontinued Operations and Noncontrolling Interest Other – net Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Common shares (in dollars per share) Common Stock, Dividends, Per Share, Declared Product Warranty Accrual [Roll Forward] Movement in Standard Product Warranty Accrual [Roll Forward] Balance at beginning of period Standard Product Warranty Accrual Accruals settled from divestiture Standard Product Warranty Accrual, Reduction for Business Disposition Standard Product Warranty Accrual, Reduction for Business Disposition Accruals for warranties issued during period Standard Product Warranty Accrual, Increase for Warranties Issued Adjustments related to pre-existing warranties Standard Product Warranty Accrual, Increase (Decrease) for Preexisting Warranties Settlements made during the period Standard Product Warranty Accrual, Decrease for Payments Balance at end of period Product Warranties Disclosures [Abstract] Product Warranties Disclosures [Abstract] Current - in the next twelve months Standard Product Warranty Accrual, Current Long-term - beyond one year Standard Product Warranty Accrual, Noncurrent Standard product warranty accrual Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value by Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value measurements on a recurring basis Fair Value, Measurements, Recurring [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Quoted prices in active markets for identical assets (Level 1) Fair Value, Inputs, Level 1 [Member] Significant other observable inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Significant unobservable inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Government securities US Government Debt Securities [Member] Corporate bonds Corporate Debt Securities [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] Available-for-sale securities, fair value disclosure Available-for-sale Securities Derivative financial instruments Derivative, Fair Value, Net Variable-rate debt obligations Long-term Debt, Fair Value Deferred stock-based compensation Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] Disposal Group, Disposed of by Sale, Not Discontinued Operations Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Pre-tax charge related to sale of business Gain (Loss) on Disposition of Business Long term note receivable Accounts and Notes Receivable, Net Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] OFM Small Office Furniture Company [Member] Small Office Furniture Company [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Annual sales of company acquired Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period Acquisition cost Business Combination, Consideration Transferred Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Useful life Finite-Lived Intangible Asset, Useful Life Goodwill increase associated with acquisition Goodwill, Period Increase (Decrease) Expected volatility (weighted-average) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate Expected dividend yield (weighted-average) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Rate Risk-free interest rate (weighted-average) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Schedule of Cash, Cash Equivalents and Investments Schedule of Cash, Cash Equivalents and Investments [Table Text Block] Schedule of Cash, Cash Equivalents and Investments [Table Text Block] Allowance for Doubtful Accounts Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Schedule Of Inventory Current Table Schedule of Inventory, Current [Table Text Block] Schedule of Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Schedule of Accounts Payable and Accrued Liabilities Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Schedule of Product Warranties Schedule of Product Warranty Liability [Table Text Block] Schedule of Product Development Expense Schedule Of Product Development Expense [Table Text Block] Schedule Of Product Development Expense [Table Text Block] Schedule of Freight Expense Schedule Of Freight Expense [Table Text Block] Schedule Of Freight Expense [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of Insurance Reserves Schedule Of Insurance Reserves [Table Text Block] Schedule Of Insurance Reserves [Table Text Block] Document and Entity Information [Abstract] Document and Entity Information [Abstract] 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 Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Common Stock, Share Outstanding Entity Common Stock, Shares Outstanding Entity Public Float Entity Public Float Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Total deferred compensation Trade accounts payable Accounts Payable, Trade, Current Compensation Accrued Salaries, Current Profit sharing and retirement expense Accrued Profit Sharing and Retirement Expense, Current Profit Sharing and Retirement Expense, Current Marketing expenses Accrued Marketing Costs, Current Freight Accrued Freight Cost, Current Accrued Freight Cost, Current Other accrued expenses Other Accrued Liabilities, Current Accounts payable and accrued expenses Income tax benefit recognized Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Cost of sales - accelerated depreciation Restructuring and Related Cost, Accelerated Depreciation Goodwill and long-lived asset impairments Asset Impairment Charges Valuation allowance of long-term note receivable Provision for Doubtful Accounts Restructuring and impairment charges Schedule of Costs of Retirement Plans Schedule of Costs of Retirement Plans [Table Text Block] Corporation common stock issued (shares) Deferred Compensation Arrangement with Individual, Shares Issued Numerator: Net Income (Loss) Attributable to Parent [Abstract] Numerator for both basic and diluted EPS attributable to HNI Corporation net income Denominators: Earnings Per Share, Basic, Other Disclosures [Abstract] Denominator for basic EPS weighted- average common shares outstanding Potentially dilutive shares from stock-based compensation plans (shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Denominator for diluted EPS (shares) Earnings per share - basic (in dollars per share) Earnings per share - diluted (in dollars per share) Antidilutive securities excluding from computation of earnings per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Reportable Segment Information Segment Reporting Disclosure [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Nature of Operations Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Operating Leases Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 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 Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total minimum lease payments Operating Leases, Future Minimum Payments Due Rent expense Operating Leases, Rent Expense Schedule of Accumulated Other Comprehensive Income Loss Table Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Schedule of Stock by Class Schedule of Stock by Class [Table Text Block] Schedule of Dividends Declared and Paid Per Share Schedule of Dividends Declared and Paid Per Share [Table Text Block] Schedule of Dividends Declared and Paid Per Share [Table Text Block]