v3.26.1
Schedule H, Line 4i – Schedule of Assets (Held At End of Year) (Details) - EBP 002 - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
EBP, Schedule of Asset Held for Investment [Line Items]    
Entity tax identification number 38-0837640  
Plan number 002  
Shares of Company common stock owned by the Plan (in shares) 1,970,330  
Participant loans $ 12,244,429  
Assets held at end of year $ 1,553,227,429  
Minimum    
EBP, Schedule of Asset Held for Investment [Line Items]    
Interest rate on participant loans (in percent) 4.25%  
Maximum    
EBP, Schedule of Asset Held for Investment [Line Items]    
Interest rate on participant loans (in percent) 10.50%  
MillerKnoll, Inc. common stock    
EBP, Schedule of Asset Held for Investment [Line Items]    
Shares of Company common stock owned by the Plan (in shares) 1,970,330 1,827,337
Current Value $ 36,017,630  
Mutual funds    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 215,140,970  
Collective trust funds    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 1,289,824,400  
Investment, Identifier [Axis]: Collective Trust Funds | Columbia | Trust Dividend Income Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 71,990,444  
Investment, Identifier [Axis]: Collective Trust Funds | Great Gray Trust | EuroPacific Growth Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 43,208,829  
Investment, Identifier [Axis]: Collective Trust Funds | Harbor Funds | Harbor Capital Appreciation Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 186,697,194  
Investment, Identifier [Axis]: Collective Trust Funds | MFS | Mid Cap Growth Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 1,703,173  
Investment, Identifier [Axis]: Collective Trust Funds | MFS | Mid Cap Value Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 993,536  
Investment, Identifier [Axis]: Collective Trust Funds | Northern Trust Global Investments | Aggregate Bond Index Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 39,509,822  
Investment, Identifier [Axis]: Collective Trust Funds | Northern Trust Global Investments | Ex-US Investable Market Index Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 37,916,306  
Investment, Identifier [Axis]: Collective Trust Funds | Northern Trust Global Investments | Russell 2000 Index Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 6,591,304  
Investment, Identifier [Axis]: Collective Trust Funds | Northern Trust Global Investments | S&P 500 Index Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 154,670,494  
Investment, Identifier [Axis]: Collective Trust Funds | Northern Trust Global Investments | S&P MidCap 400 Index Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 27,275,072  
Investment, Identifier [Axis]: Collective Trust Funds | Putnam Fiduciary Trust Company | Stable Value Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 103,660,188  
Investment, Identifier [Axis]: Collective Trust Funds | Vanguard | Retirement 2020 Trust I    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 19,995,063  
Investment, Identifier [Axis]: Collective Trust Funds | Vanguard | Retirement 2025 Trust I    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 60,293,448  
Investment, Identifier [Axis]: Collective Trust Funds | Vanguard | Retirement 2030 Trust I    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 86,298,981  
Investment, Identifier [Axis]: Collective Trust Funds | Vanguard | Retirement 2035 Trust I    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 102,245,805  
Investment, Identifier [Axis]: Collective Trust Funds | Vanguard | Retirement 2040 Trust I    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 74,688,059  
Investment, Identifier [Axis]: Collective Trust Funds | Vanguard | Retirement 2045 Trust I    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 74,073,774  
Investment, Identifier [Axis]: Collective Trust Funds | Vanguard | Retirement 2050 Trust I    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 73,868,234  
Investment, Identifier [Axis]: Collective Trust Funds | Vanguard | Retirement 2055 Trust I    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 56,568,477  
Investment, Identifier [Axis]: Collective Trust Funds | Vanguard | Retirement 2060 Trust I    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 33,800,772  
Investment, Identifier [Axis]: Collective Trust Funds | Vanguard | Retirement 2065 Trust I    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 11,687,463  
Investment, Identifier [Axis]: Collective Trust Funds | Vanguard | Retirement 2070 Trust I    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 1,783,475  
Investment, Identifier [Axis]: Collective Trust Funds | Vanguard | Retirement Income Trust II    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 20,304,487  
Investment, Identifier [Axis]: Mutual Funds | BlackRock | Black Rock Equity Dividend Fund I Class    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 0  
Investment, Identifier [Axis]: Mutual Funds | Calvert | U.S. Large Cap Core Responsible Index Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 20,842,934  
Investment, Identifier [Axis]: Mutual Funds | Delaware | Small Cap Value Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 24,476,037  
Investment, Identifier [Axis]: Mutual Funds | Dodge & Cox | Total Income Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 67,089,996  
Investment, Identifier [Axis]: Mutual Funds | Driehaus | Emerging Markets Growth Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 5,193,112  
Investment, Identifier [Axis]: Mutual Funds | Vanguard | Small Cap Growth Index Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 47,225,070  
Investment, Identifier [Axis]: Mutual Funds | Vanguard | Wellington Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value $ 50,313,821