Equity [Abstract] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] 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 Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Beginning balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Other comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, before Tax Tax (expense) or benefit Other Comprehensive Income (Loss) before Reclassifications, Tax Amounts reclassified from accumulated other comprehensive income (loss), net of tax Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Ending balance Statement of Stockholders' Equity [Abstract] Cash dividends (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Restructuring and Related Activities [Abstract] Sale Leaseback Transaction [Table] Sale Leaseback Transaction [Table] Sale Leaseback Transaction, Description [Axis] Sale Leaseback Transaction, Description [Axis] Sale Leaseback Transaction, Name [Domain] Sale Leaseback Transaction, Name [Domain] Manufacturing Facility Manufacturing Facility [Member] Sale Leaseback Transaction [Line Items] Sale Leaseback Transaction [Line Items] Term of lease Sale Leaseback Transaction, Term Of Lease Sale Leaseback Transaction, Term Of Lease Net proceeds from sale of facility Sale Leaseback Transaction, Net Proceeds, Investing Activities Deferred gain Sale Leaseback Transaction, Deferred Gain, Net Deferred gain, current Sale Leaseback Transaction, Deferred Gain, Net, Current Sale Leaseback Transaction, Deferred Gain, Net, Current Deferred gain, noncurrent Sale Leaseback Transaction, Deferred Gain, Net, Noncurrent Sale Leaseback Transaction, Deferred Gain, Net, Noncurrent Income Tax Disclosure [Abstract] Income before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income taxes Income Tax Expense (Benefit) Effective tax rate Effective Income Tax Rate Reconciliation, Percent Segment Reporting [Abstract] 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 segments 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] Number of reportable segments Number of Reportable Segments Net sales Revenue from Contract with Customer, Including Assessed Tax Operating income Operating Income (Loss) Interest income (expense) Interest Income (Expense), Net Income before income taxes Depreciation and amortization Depreciation, Depletion and Amortization Capital expenditures (including capitalized software) Payments to Acquire Productive Assets Identifiable assets Assets Goodwill and Intangible Assets Disclosure [Abstract] 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 and Goodwill Schedule of Indefinite-Lived Intangible Assets [Table Text Block] 2018 Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 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 Statement [Table] Statement [Table] Equity Components [Axis] Common Stock Common Stock [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Retained Earnings Retained Earnings [Member] Accumulated Other Comprehensive Income (Loss) Non-controlling Interest Noncontrolling Interest [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Comprehensive income: Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Change in ownership of non-controlling interest Noncontrolling Interest, Change in Ownership of Noncontrolling Interest Noncontrolling Interest, Change in Ownership of Noncontrolling Interest 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 Schedule of Finite-Lived Intangible Assets by Major Class [Table] Schedule of Finite-Lived Intangible Assets [Table] 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] Patents Patents [Member] Software Computer Software, Intangible Asset [Member] Trademarks and trade names Trademarks and Trade Names [Member] Customer lists and other Customer Lists and Other Intangible Assets [Member] Customer Lists and Other Intangible Assets [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Gross Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Net Finite-Lived Intangible Assets, Net Income Statement [Abstract] Cost of sales Cost of Goods and Services Sold Gross profit Gross Profit Selling and administrative expenses Selling, General and Administrative Expense Restructuring and impairment charges Restructuring, Settlement and Impairment Provisions Operating income Interest income Investment Income, Interest Interest expense Interest Expense Income taxes Net income Less: Net income (loss) attributable to 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 (in 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 (in 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), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, 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 Disclosure of Compensation Related Costs, Share-based Payments [Abstract] 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] Equity Award [Domain] Equity Award [Domain] Stock options Employee Stock Option [Member] Restricted Stock Units (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] Compensation cost Allocated Share-based Compensation Expense Fair value of granted stock options Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Fair Value Unrecognized compensation cost Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Weighted-Average Remaining Service Period (years) Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Restructuring Plan [Axis] Restructuring Plan [Axis] Restructuring Plan [Domain] Restructuring Plan [Domain] Realignment of Office Furniture Facilities and Exit of Business Line Realignment of Office Furniture Facilities and Exit of Business Line [Member] Realignment of Office Furniture Facilities and Exit of Business Line [Member] Restructuring Type [Axis] Restructuring Type [Axis] Type of Restructuring [Domain] Type of Restructuring [Domain] Severance Costs Employee Severance [Member] Facility Exit Costs & Other Facility Closing [Member] Restructuring Cost and Reserve [Line Items] Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Restructuring allowance as of December 30, 2017 Restructuring Reserve Restructuring charges Restructuring Charges Cash payments Payments for Restructuring Restructuring allowance as of June 30, 2018 Schedule of Income Tax Provision Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Inventory Disclosure [Abstract] Schedule of Inventories Schedule of Inventory, Current [Table Text Block] Accumulated Other Comprehensive Income (Loss) and Shareholders' Equity Stockholders' Equity Note Disclosure [Text Block] Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Accounting Changes and Error Corrections [Abstract] Inventories Inventory, Policy [Policy Text Block] Goodwill and Other Intangible Assets Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Product Warranties Standard Product Warranty, Policy [Policy Text Block] Fair Value Measurements Fair Value of Financial Instruments, Policy [Policy Text Block] Share-based Compensation, Option and Incentive Plans Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Recently Adopted Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Business Segment Information Segment Reporting, Policy [Policy Text Block] Inventories Inventory Disclosure [Text Block] Retirement Benefits [Abstract] Post-Retirement Health Care Pension and Other Postretirement Benefits Disclosure [Text Block] 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] Ten-year fixed rate notes with an interest rate of 4.40% Ten Year Four Point Four Zero Percent Private Placement Notes [Member] Ten Year Four Point Four Zero Percent Private Placement Notes [Member] Seven-year fixed rate notes with an interest rate of 4.22% Seven Year Four Point Two Two Percent Private Placement Notes [Member] Seven Year Four Point Two Two Percent Private Placement Notes [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Revolving credit facility with interest at a variable rate (June 30, 2018 - 3.3%; December 30, 2017 - 2.7%) Revolving Credit Facility [Member] Other amounts Other Notes [Member] Other Notes [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Stated Interest Rate Percentage Debt Instrument, Interest Rate, Stated Percentage Note term Debt Instrument, Term Total debt Long-term Debt Deferred debt issuance costs Debt Issuance Costs, Net Current maturities of long-term debt Long-term Debt, Current Maturities Long-term debt Long-term Debt, Excluding Current Maturities Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Repurchased common stock (in shares) Stock Repurchased During Period, Shares Cash purchase price Stock Repurchased During Period, Cash Purchase Price Stock Repurchased During Period, Cash Purchase Price Purchases unsettled as of quarter end Stock Repurchased During Period, Not Settled, Value Stock Repurchased During Period, Not Settled, Value Prior year purchases settled in current year Stock Repurchased During Prior Period, Settled, Value Stock Repurchased During Prior Period, Settled, Value Shares repurchased per cash flow Payments for Repurchase of Common Stock Percentage of LIFO Inventory Percentage of LIFO Inventory Inventories 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 Total inventories Inventory, Net Commitments and Contingencies Disclosure [Abstract] Line of Credit Facility [Table] Line of Credit Facility [Table] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Letter of Credit Letter 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] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Letters of credit Long-term Line of Credit Revenue from Contract with Customer [Abstract] Trade receivables Accounts Receivable, Gross Contract assets (current) Contract with Customer, Asset, Net, Current Contract assets (long-term) Contract with Customer, Asset, Net, Noncurrent Contract liabilities Contract with Customer, Liability Statement of Financial Position [Abstract] Assets Assets [Abstract] Current Assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value 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, at cost 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 Deferred Income Tax Assets, Net 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 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 Deferred Income Tax Liabilities, Net Equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] HNI Corporation shareholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Capital Stock: Capital [Abstract] Preferred stock - $1 par value, authorized 2,000 shares, no shares outstanding Preferred Stock, Value, Outstanding Common stock - $1 par value, authorized 200,000 shares, outstanding: June 30, 2018 - 43,736 shares; December 31, 2017 - 43,354 shares 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 Income Taxes Income Tax Disclosure [Text Block] Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Contract with Customer, Asset and Liability Contract with Customer, Asset and Liability [Table Text Block] Summary of Restructuring Costs Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest rate swap Interest Rate Swap [Member] Class of Stock [Line Items] Class of Stock [Line Items] Derivative, notional amount Derivative, Notional Amount Derivative, fixed interest rate Derivative, Fixed Interest Rate Derivative liability Derivative Liability Stock repurchase program, remaining authorized repurchase amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Schedule of Stock Based Compensation Expense Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period Share-based Compensation, Activity [Table Text Block] Schedule of Unrecognized Compensation Cost, Nonvested Awards Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block] Product Warranties Disclosures [Abstract] Activity Associated with Warranty Obligations Schedule of Product Warranty Liability [Table Text Block] Product Warranty Accrual [Roll Forward] Movement in Standard Product Warranty Accrual [Roll Forward] Balance at beginning of period Standard Product Warranty Accrual 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 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] Indefinite-lived intangible assets Indefinite-lived Intangible Assets (Excluding Goodwill) 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 Foreign currency translation adjustments Goodwill, Foreign Currency Translation Gain (Loss) Goodwill, gross, ending balance Accumulated impairment losses, ending balance Goodwill, net, ending balance Business Combinations [Abstract] Acquisitions and Divestitures Business Combination Disclosure [Text Block] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Cost of sales - accelerated depreciation Cost of Sales [Member] Restructuring and impairment charges Restructuring Charges [Member] Restructuring Cost and Reserve [Line Items] Restructuring costs Restructuring and Related Cost, Incurred Cost Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Reportable Segment Data Schedule of Segment Reporting Information, by Segment [Table Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Contract with Customer, Sales Channel [Axis] Contract with Customer, Sales Channel [Axis] Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] Supplies-driven channel Sales Channel, Supplies Driven [Member] Sales Channel, Supplies Driven [Member] Contract channel Sales Channel, Contract [Member] Sales Channgel, Contract [Member] Hearth Sales Channel, Hearth [Member] Sales Channel, Hearth [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Revenue from contracts with customers Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] 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] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Interest (expense) or income Tax (expense) or benefit Earnings Per Share [Abstract] Earnings Per Share Earnings Per Share [Text Block] Cash dividends per common share (in dollars per share) Common Stock, Dividends, Per Share, Declared Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, shares outstanding (in 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 (in shares) Common Stock, Shares Authorized Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Reportable Segment Information Segment Reporting Disclosure [Text Block] Statement of Cash Flows [Abstract] Net Cash Flows From (To) Operating Activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net income Non-cash items included in net income: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Other post-retirement and post-employment benefits Pension and Other Postretirement Benefits Cost (Reversal of Cost) Stock-based compensation Share-based Compensation Deferred income taxes Deferred Income Taxes and Tax Credits (Gain) loss on sale, retirement, and impairment of long-lived assets, net Net Gain (Loss) On Sales And Retirements of Long Lived Assets And Intangibles Net Gain (Loss) On Sales And Retirements of Long Lived Assets And Intangibles Amortization of deferred gain on sale leaseback transaction Sale Leaseback Transaction, Current Period Gain Recognized Other – net Other Noncash Income (Expense) Net increase (decrease) in operating assets and liabilities, net of 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 Productive Assets, Excluding Software The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures) and other intangible assets. Proceeds from sale of property, plant, and equipment Proceeds from Sale of Property, Plant, and Equipment Capitalized software Payments to Acquire Software 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 long-term debt and other financing Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities Proceeds from long-term debt Proceeds from Issuance of Long-term Debt Dividends paid Payments of Dividends Purchase of HNI Corporation 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 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 period Cash and cash equivalents at end of period Components of Net Periodic Benefit Cost Schedule of Defined Benefit Plans Disclosures [Table Text Block] Schedule of Debt Schedule of Debt [Table Text Block] Fair Value Disclosures [Abstract] Schedule of Assets Measured at Fair Value Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Restructuring Restructuring and Related Activities Disclosure [Text Block] Contract assets increase (decrease) Change in Contract with Customer, Asset [Abstract] Contract assets recognized Contract With Customer, Asset, Increase For Contract Assets Recognized In Period Contract With Customer, Asset, Increase For Contract Assets Recognized In Period Reclassification of contract assets to contra revenue Contract With Customer, Asset, Reclassified To Contra Revenue Contract With Customer, Asset, Reclassified To Contra Revenue Impact of business combination Contract with Customer, Asset, Increase (Decrease) for Contract Acquired in Business Combination Net change Contract With Customer, Asset, Net Increase (Decrease) Contract With Customer, Asset, Net Increase (Decrease) Contract liabilities (increase) decrease Change in Contract with Customer, Liability [Abstract] Contract liabilities recognized and recorded to contra revenue as a result of performance obligations satisfied Contract With Customer, Liability, Performance Obligation Contra Revenue Contract With Customer, Liability, Performance Obligation Contra Revenue Contract liabilities paid Contract With Customer, Liability, Contract Liabilities Paid Contract With Customer, Liability, Contract Liabilities Paid Cash received in advance and not recognized as revenue Contract With Customer, Liability, Cash Received In Advance, Not Recorded As Revenue Contract With Customer, Liability, Cash Received In Advance, Not Recorded As Revenue Reclassification of cash received in advance to revenue as a result of performance obligations satisfied Contract with Customer, Liability, Change in Timeframe, Performance Obligation Satisfied, Revenue Recognized Impact of business combination Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination Net change Contract With Customer, Liability, Net Increase (Decrease) Contract With Customer, Liability, Net Increase (Decrease) 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 (in shares) Potentially dilutive shares from stock-based compensation plans (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Denominator for diluted EPS (in shares) Earnings per share - basic (in dollars per share) Earnings per share - diluted (in dollars per share) Product Warranties Product Warranty Disclosure [Text Block] Capitalized software Capitalized Computer Software, Amortization Other definite-lived intangibles Amortization of Intangible Assets Measurement Input Type [Axis] Measurement Input Type [Axis] Measurement Input Type [Domain] Measurement Input Type [Domain] Discount Rate Measurement Input, Discount Rate [Member] Near Term Growth Rate Measurement Input, Near Term Growth Rate [Member] Measurement Input, Near Term Growth Rate [Member] Long-term Revenue Growth Rate Measurement Input, Long-term Revenue Growth Rate [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Reporting Unit [Axis] Reporting Unit [Axis] Reporting Unit [Domain] Reporting Unit [Domain] One Reporting Unit One Reporting Unit [Member] One Reporting Unit [Member] Goodwill impairment test measurement input Goodwill Impairment Test, Measurement Input Goodwill Impairment Test, Measurement Input Increase (decrease) in fair value for 100 basis point increase in discount rate Reporting Unit, Increase (Decrease) In Fair Value For 100 Basis Point Increase In Discount Rate Reporting Unit, Increase (Decrease) In Fair Value For 100 Basis Point Increase In Discount Rate Increase (decrease) in fair value for 100 basis point decrease in long-term growth rate Reporting Unit, Increase (Decrease) In Fair Value For 100 Basis Point Decrease In Long-Term Growth Rate Reporting Unit, Increase (Decrease) In Fair Value For 100 Basis Point Decrease In Long-Term Growth Rate Goodwill Schedule of Earnings Per Share Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Weighted Average Number of Shares Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Long-Term Debt Debt Disclosure [Text Block] Revenue from Contracts with Customers Revenue from Contract with Customer [Text Block] Service cost Defined Benefit Plan, Service Cost Interest cost Defined Benefit Plan, Interest Cost Amortization of net (gain) loss Defined Benefit Plan, Amortization of Gain (Loss) Net periodic post-retirement benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Private Placement Private Placement Notes [Member] Private Placement Notes [Member] Deferred debt issuance costs, current Debt Issuance Costs, Gross, Current Deferred debt issuance costs, noncurrent Debt Issuance Cost, Gross, Noncurrent Long-term line of credit outstanding Line of credit maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Borrowings Debt Instrument, Face Amount 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 Debt Instrument, Covenant, Ratio of Interest Coverage to Earnings for the Last Four Fiscal Quarters 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 Debt Instrument, Covenant, Ratio of Leverage to Earnings for the Last Four Fiscal Quarters Fair Value Measurements of Financial Instruments Fair Value Disclosures [Text Block] Guarantees and Product Warranties [Abstract] Current - in the next twelve months Standard Product Warranty Accrual, Current Long-term - beyond one year Standard Product Warranty Accrual, Noncurrent Total estimated settlements Revenue recognized Contract with Customer, Liability, Revenue Recognized Recently Adopted Accounting Standards New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Definite-lived intangible assets Total goodwill and other intangible assets Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Variable Rate Debt Obligation Variable Rate Debt Obligation [Member] Variable Rate Debt Obligation [Member] Fixed Rate Debt Obligation Fixed Rate Debt Obligation [Member] Fixed Rate Debt Obligation [Member] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair value, measurements, recurring Fair Value, Measurements, Recurring [Member] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Government securities Agency Securities [Member] Corporate Bonds Corporate Debt Securities [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [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] 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] Cash and cash equivalents (including money market funds) Available-for-sale debt securities Debt Securities, Available-for-sale Derivative financial instruments Derivative, Fair Value, Net Fair value of debt obligations Long-term Debt, Fair Value Deferred stock-based compensation Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Common stock equivalents excluded because their inclusion would be anti-dilutive Stock Compensation Plan [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive securities excluded from computation of earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Schedule of Components of Accumulated Other Comprehensive Income and Changes in Accumulated Other Comprehensive Income, Net of Tax Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of Reclassification from Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Schedule of Share Repurchases Accelerated Share Repurchases [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] Guarantees, Commitments and Contingencies Commitments and Contingencies Disclosure [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 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 Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding