Entity tax identification number Entity Tax Identification Number Rollover EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Maximum Maximum [Member] Administrative expenses paid using forfeitures EBP, Forfeited Nonvested Account, Decrease from Administrative Expense Legal Entity [Axis] Legal Entity [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] EBP, Description of Plan [Table] EBP, Description of Plan [Table] Mutual funds Mutual Fund [Member] Other investments measured at NAV EBP, Other Investment [Member] Tranche One EBP, Employer Contribution Vesting Schedule, Tranche One [Member] EBP, Employer Contribution Vesting Schedule, Tranche One EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] Maximum annual participant contribution rate, as percentage of compensation (in percent) EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Total deductions EBP, Change in Net Asset Available for Benefit, Decrease Maximum borrowing, amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Fair Value Measurements EBP, Investment, Fair Value and NAV [Text Block] EBP, Employer Contribution Vesting Schedule [Axis] EBP, Employer Contribution Vesting Schedule [Axis] EBP, Employer Contribution Vesting Schedule Investments at fair value Total investments at fair value EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Maximum vesting age EBP, Employer Contribution Maximum Vesting Age EBP, Employer Contribution Maximum Vesting Age Level 1 Fair Value, Inputs, Level 1 [Member] EBP, Investment, Fair Value and NAV [Abstract] Assets EBP, Asset [Abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] Additions to net assets attributed to: EBP, Change in Net Asset Available for Benefit, Increase [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Payment of Benefits EBP, Payment to Participant [Policy Text Block] Amendment Flag Amendment Flag Tranche Two EBP, Employer Contribution Vesting Schedule, Tranche Two [Member] EBP, Employer Contribution Vesting Schedule, Tranche Two Basis of Accounting EBP, Basis of Accounting [Policy Text Block] EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] Shares of Company common stock owned by the Plan (in shares) EBP, Investment, Number of Shares EBP, Description of Plan and Accounting Change [Abstract] Receivables: EBP, Receivable [Abstract] Summary of Plan's Investments Measured at Fair Value on Recurring Basis EBP, Investment, Fair Value and NAV [Table Text Block] Investments [Domain] Investments [Domain] Use of Estimates EBP, Use of Estimate [Policy Text Block] Schedule H, Line 4i – Schedule of Assets (Held At End of Year) EBP, Schedule of Asset Held for Investment [Text Block] Cover [Abstract] Risks and Uncertainties EBP, Risk and Uncertainty [Text Block] Minimum Minimum [Member] Accrued investment income EBP, Investment Income, Receivable Investment Type [Axis] Investment Type [Axis] Interest income - notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Employee EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Minimum age for participant to qualify EBP, Participant Contribution, Minimum Age EBP, Participant Contribution, Minimum Age Net appreciation in fair value of investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment Interest and dividends EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] Plan number EBP, Plan Number EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] Plan Description EBP, Description of Plan [Text Block] Vesting rate on employer discretionary and matching contributions (in percent) EBP, Employer Contribution Vesting Percentage EBP, Employer Contribution Vesting Percentage Changes in Net Asset Available for Benefit EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] MillerKnoll, Inc. common stock EBP, Employer, Common Stock [Member] EBP, Schedule of Asset Held for Investment [Abstract] EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Total income and contributions EBP, Change in Net Asset Available for Benefit, Increase Investment income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Investment, Identifier [Axis] Investment, Identifier [Axis] Administrative expenses EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Assets held at end of year EBP, Asset Held for Investment Principal dwelling borrowing term EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term Document Information [Line Items] Document Information [Line Items] EBP, Risk and Uncertainty [Line Items] EBP, Risk and Uncertainty [Line Items] EBP, Risk and Uncertainty [Table] EBP, Risk and Uncertainty [Table] Eligible compensation subject to Company's match (percent) EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Level 2 Fair Value, Inputs, Level 2 [Member] Employer EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash and Noncash EBP, Tax Status [Table] EBP, Tax Status [Table] Related Party and Party-in-Interest Transactions EBP, Related Party and Party-in-Interest Transactions [Text Block] EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Total receivables EBP, Receivable Employer contributions EBP, Employer Contribution, Receivable Automatic deferral rate (in percent) EBP, Participant Contribution, Automatic, Deferral Rate Income related to dividends from shares of Company common stock EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment Benefit payments EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Current Value EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Annual automatic increase in participant deferral rate (percent) EBP, Participant Contribution, Automatic, Annual Increase Deferral Rate EBP, Participant Contribution, Automatic, Annual Increase Deferral Rate Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] EBP, Employer Contribution, Type [Domain] EBP, Employer Contribution, Type [Domain] EBP, Employer Contribution, Type [Domain] EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Employer Contribution, Type [Axis] EBP, Employer Contribution, Type [Axis] EBP, Employer Contribution, Type EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] Loan borrowing term EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term EBP, Tax Status [Abstract] Interest in participant's account securing loan (in percent) EBP, Participant Loan, Percentage Of Interest In Note Receivable From Participant Securing Loan EBP, Participant Loan, Percentage Of Interest In Note Receivable From Participant Securing Loan Participant loans EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Investment Valuation and Income Recognition EBP, Investment [Policy Text Block] Employee contributions EBP, Participant Contribution, Receivable Fair Value Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Document Type Document Type Entity Central Index Key Entity Central Index Key Interest rate on participant loans (in percent) EBP, Asset Held for Investment, Participant Loan, Interest Rate Collective trust funds Common Collective Trust [Member] EBP, Risk and Uncertainty [Abstract] EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] EBP, Subsequent Event [Table] EBP, Subsequent Event [Table] Deductions from net assets attributed to: EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Employer contributions reduced by forfeitures EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Notes receivable from participants EBP, Note Receivable from Participant Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Summary of Significant Accounting and Reporting Policies EBP, Summary of Accounting Policy [Text Block] Entity Registrant Name Entity Registrant Name Investments in MillerKnoll, Inc. common stock (percent) EBP, Risk and Uncertainty, Concentration of Investment at Fair Value to Net Assets, Percentage EBP, Subsequent Event [Abstract] Subsequent Events EBP, Subsequent Event [Text Block] Income Tax Status EBP, Tax Status [Text Block] Maximum borrowing, to total account, percentage (in percent) EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Net increase EBP, Change In Net Asset Available For Benefit, After Transfer To (From) Plan EBP, Change In Net Asset Available For Benefit, After Transfer To (From) Plan EBP, Discretionary Employer Contribution EBP, Discretionary Employer Contribution [Member] EBP, Discretionary Employer Contribution EBP, Subsequent Event [Line Items] EBP, Subsequent Event [Line Items] Document Information [Table] Document Information [Table] Notes Receivable from Participants EBP, Note Receivable from Participant [Policy Text Block] Total investment income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment EBP 002 EBP 002 [Member] EBP 002 EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] Level 3 Fair Value, Inputs, Level 3 [Member] EBP, Employer Contribution Vesting Schedule [Domain] EBP, Employer Contribution Vesting Schedule [Domain] EBP, Employer Contribution Vesting Schedule Net assets available for benefits Beginning of year End of year EBP, Net Asset Available for Benefit Entity [Domain] Entity [Domain] Contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Unallocated forfeitures EBP, Forfeited Nonvested Account Company's match on participants' elective deferral contributions (percent) EBP, Employer Contribution, Matching Percentage NAV Fair Value Measured at Net Asset Value Per Share [Member] EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] Vesting service period EBP, Employer Contribution Vesting Service Period EBP, Employer Contribution Vesting Service Period Net Assets Available for Benefits EBP, Statement of Net Asset Available for Benefit [Line Items]