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[Abstract] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Deferred Income Taxes Deferred Income Tax Liabilities, Net Security Exchange Name Security Exchange Name Seating Seating Products [Member] Seating Products Current - in the next twelve months Standard Product Warranty Accrual, Current Trademarks and trade names Trademarks and Trade Names [Member] Proceeds from long-term debt Proceeds from Issuance of Long-term Debt Operating income Operating income Operating Income (Loss) Total Current Liabilities Liabilities, Current Reclassifications from accumulated other comprehensive income (loss) Reclassification out of Accumulated Other Comprehensive Income [Member] Systems and storage Systems And Storage Products [Member] Systems And Storage Products Contract with Customer, Asset and Liability Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text 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Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] 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 Income Statement [Abstract] Income Statement [Abstract] Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Long-Term Lease Obligations - Operating Operating Lease, Liability, Noncurrent 2024 Finite-Lived Intangible Asset, Expected Amortization, Year Four Accruals for warranties issued during period Standard Product Warranty Accrual, Increase for Warranties Issued Change in pension and post-retirement liability, net of tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Current 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Arrangement [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Current lease obligations - operating Operating Lease, Liability, Current Less: Net income (loss) attributable to non-controlling interest Net Income (Loss) Attributable to Noncontrolling Interest Amortization of net loss Defined Benefit Plan, Amortization of Gain (Loss) Contract assets (long-term) Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent Entity Interactive Data Current Entity Interactive Data Current Net periodic post-retirement benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Common shares – treasury: Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract] Fair Value Measurements of Financial Instruments Fair Value Disclosures [Text Block] Net Cash Flows From (To) Operating Activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Accumulated Other Comprehensive Income (Loss) and Shareholders' Equity Stockholders' Equity Note Disclosure [Text Block] Share-based Compensation, Option and Incentive Plans Share-based Payment Arrangement [Policy Text Block] Interest rate swap Interest Rate Swap [Member] 2020 Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Cumulative Effect, Period Of Adoption, Adjustment Cumulative Effect, Period of Adoption, Adjustment [Member] Additional paid-in capital Additional Paid in Capital, Common Stock Entity Registrant Name Entity Registrant Name Business Acquisition [Line Items] Business Acquisition [Line Items] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Deferred debt issuance costs Debt Issuance Costs, Net Number of reportable segments Number of Reportable Segments Schedule of Unrecognized Compensation Cost, Nonvested Awards Share-based Payment Arrangement, Nonvested Award, Cost [Table Text Block] Other post-retirement and post-employment benefits Pension and Other Postretirement Benefits Cost (Reversal of Cost) Consolidation Items [Axis] Consolidation Items [Axis] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Impairment losses Goodwill impairment losses Goodwill, Impairment Loss Finished products Inventory, Finished Goods, Gross Accounting Standards Update [Axis] Accounting Standards Update [Axis] Net change Contract With Customer, Liability, Net Increase (Decrease) Contract With Customer, Liability, Net Increase (Decrease) Accounting Standards Update 2016-02 Accounting Standards Update 2016-02 [Member] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Goodwill Goodwill, net, beginning balance Goodwill, net, ending balance Goodwill Payments of long-term debt Repayment of Long-term Debt, Long-term Lease Obligation, and Capital Security Schedule of Share Repurchases Accelerated Share Repurchases [Table Text Block] Document Transition Report Document Transition Report Prior year purchases settled in current year Stock Repurchased During Prior Period, Settled, Value Stock Repurchased During Prior Period, Settled, Value Numerator: Net Income (Loss) Attributable to Parent [Abstract] Reporting Unit Two Reporting Unit Two [Member] Reporting Unit Two [Member] Cash dividends (in dollars per share) Common Stock, Dividends, Per Share, Declared Borrowings Debt Instrument, Face Amount Cash purchase price Stock Repurchased During Period, Cash Purchase Price Stock Repurchased During Period, Cash Purchase Price Significant other observable inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Document Quarterly Report Document Quarterly Report Schedule of Goodwill Schedule of Goodwill [Table Text Block] Last-in, first-out ("LIFO") allowance Inventory, LIFO Reserve Equity [Abstract] Equity [Abstract] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Contract length 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at Fair Value Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Net income attributable to HNI Corporation per common share – basic (in dollars per share) Earnings per share - basic (in dollars per share) Earnings Per Share, Basic Entity File Number Entity File Number Debt Disclosure [Abstract] Debt Disclosure [Abstract] Three Small Residential Building Products Companies Three Small Residential Building Products Companies [Member] Three Small Residential Building Products Companies Net cash flows from (to) financing activities Net Cash Provided by (Used in) Financing Activities Compensation cost Share-based Payment Arrangement, Expense Unrealized Gains (Losses) on Debt Securities AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] Common stock - $1 par value, authorized 200,000 shares, outstanding: September 26, 2020 - 42,715 shares; December 28, 2019 - 42,595 shares Common Stock, Value, Issued Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Deferred stock-based compensation Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent Impairment of definite-lived intangible assets Impairment of Intangible Assets, Finite-lived Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Document Fiscal Year Focus Document Fiscal Year Focus 2022 Finite-Lived Intangible Asset, Expected Amortization, Year Two Current maturities of long-term debt Long-term Debt, Current Maturities Entity Current Reporting Status Entity Current Reporting Status Contract liabilities (increase) decrease Change in Contract with Customer, Liability [Abstract] Capitalized software Capitalized Computer Software, Amortization Retirement Benefits [Abstract] Retirement Benefits [Abstract] Trade Letters Of Credit And Bankers Acceptances Trade Letters Of Credit And Bankers Acceptances [Member] Trade Letters Of Credit And Bankers 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Revenue Capitalized software Payments to Acquire Software Long-Term Debt Long-term debt Long-term Debt, Excluding Current Maturities Segment Reporting [Abstract] Segment Reporting [Abstract] Debt Instrument [Line Items] Debt Instrument [Line Items] Total HNI Corporation shareholders' equity Stockholders' Equity Attributable to Parent Total Liabilities and Equity Liabilities and Equity Buildings Buildings and Improvements, Gross Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Government securities Agency Securities [Member] Income Taxes Income Tax Disclosure [Text Block] Entity Address, City or Town Entity Address, City or Town Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Restricted stock units Restricted Stock Units (RSUs) [Member] Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities, Current Deferred debt issuance costs, noncurrent Debt Issuance Cost, Gross, Noncurrent Financial Instrument [Axis] Financial Instrument [Axis] Accounting Standards Update [Domain] Accounting Standards Update [Domain] Common stock equivalents excluded because their inclusion would be anti-dilutive (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Other – net Other Noncash Income (Expense) Dividend Paid Dividend Paid [Member] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets [Axis] Equity Component [Domain] Equity Component [Domain] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Dividends paid Payments of Dividends Gross profit Gross Profit Net Property, Plant, and Equipment Property, Plant and Equipment, Net 2023 Finite-Lived Intangible Asset, Expected Amortization, Year Three Entity Tax Identification Number Entity Tax Identification Number Revenue Revenue from Contract with Customer [Policy Text Block] Interest expense, net Interest Income (Expense), Nonoperating, Net Stock-Based Compensation Share-based Payment Arrangement [Text Block] Net income attributable to HNI Corporation Net of tax Numerator for both basic and diluted EPS attributable to HNI Corporation net income Net Income (Loss) Attributable to Parent Long-Term Lease Obligations - Finance Finance Lease, Liability, Noncurrent Denominators: Earnings Per Share, Basic, Other Disclosures [Abstract] Current maturities of other long-term obligations Other Liabilities, Current Inventories Inventory Disclosure [Text Block] Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Trade Names Trade Names [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Total Current Assets Assets, Current Current Fiscal Year End Date Current Fiscal Year End Date Less: Comprehensive income (loss) attributable to non-controlling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Earnings Per Share [Abstract] Earnings Per Share [Abstract] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Dividends [Axis] Dividends [Axis] Asset Acquisition [Domain] Asset Acquisition [Domain] [Domain] for Asset Acquisition [Axis] Pension and Post-retirement Liabilities Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] HNI Corporation shareholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Dividend Declared Dividend Declared [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Estimated deferred tax benefit, CARES Act Deferred Tax Benefit, CARES Act Deferred Tax Benefit, CARES Act Document Fiscal Period Focus Document Fiscal Period Focus Impairment of goodwill and intangible assets Goodwill and Intangible Asset Impairment Average price per share (in dollars per share) Shares Repurchased During Period, Average Price Per Share Shares Repurchased During Period, Average Price Per Share Entity Filer Category Entity Filer Category Common Stock Common Stock [Member] Foreign Currency Translation Adjustment Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Product and Service [Domain] Product and Service [Domain] Change in derivative financial instruments, net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent Schedule of Reclassification from Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Line of credit remaining 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[Table] Accounting Standards Update and Change in Accounting Principle [Table] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Net income attributable to HNI Corporation per common share – diluted (in dollars per share) Earnings per share - diluted (in dollars per share) Earnings Per Share, Diluted Current lease obligations - finance Finance Lease, Liability, Current Local Phone Number Local Phone Number Cumulative Effect, Period Of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] Finite-lived Intangible Assets Amortization Expense Finite-lived Intangible Assets Amortization Expense [Table Text Block] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Schedule of Debt Schedule of Debt [Table Text Block] Schedule of Indefinite Lived Intangible Assets and Goodwill Schedule of Indefinite-Lived Intangible Assets [Table Text Block] Derivative Financial Instruments Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Contract liabilities Contract with Customer, Liability Entity Emerging Growth Company Entity Emerging Growth Company Indefinite-lived intangible assets Indefinite-lived Intangible Assets (Excluding Goodwill) Schedule of Finite-Lived Intangible Assets by Major Class [Table] Schedule of Finite-Lived Intangible Assets [Table] Line of credit maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Award Type [Axis] Award Type [Axis] Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Non-controlling Interest Noncontrolling Interest [Member] Dividends Dividends, Common Stock, Cash Retained Earnings Retained Earnings [Member] Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding 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] Effective tax rate Effective Income Tax Rate Reconciliation, Percent Net cash flows from (to) investing activities Net Cash Provided by (Used in) Investing Activities Purchase of investments Payments to Acquire Investments Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Allowance for doubtful accounts Allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss Award Type [Domain] Award Type [Domain] Corporate bonds Corporate Debt Securities [Member] Trading Symbol Trading Symbol 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 Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Payments for asset acquisitions Payments For Asset Acquisitions Payments For Asset Acquisitions Net change Contract With Customer, Asset, Net Increase (Decrease) Contract With Customer, Asset, Net Increase (Decrease) Settlements made during the period Standard Product Warranty Accrual, Decrease for Payments Other amounts Other Notes [Member] Other Notes [Member] Impairment and restructuring charges Restructuring, Settlement and Impairment Provisions Earnings Per Share Earnings Per Share [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Current Liabilities: Liabilities, Current [Abstract] Entity Shell Company Entity Shell Company Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Fair value, measurements, recurring Fair Value, Recurring [Member] Business Segment Information Segment Reporting, Policy [Policy Text Block] Recently Adopted Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Subsegments [Axis] Subsegments [Axis] Short-term investments Short-term Investments