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Stock-Based Compensation - Narrative (Details)
 12 Months Ended 41 Months Ended
Jul. 19, 2021
May 31, 2025
USD ($)
$ / shares
shares
Jun. 01, 2024
USD ($)
$ / shares
shares
Jun. 03, 2023
USD ($)
$ / shares
shares
May 31, 2025
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award          
Stock-based compensation cost not yet recognized | $   $ 15,300,000     $ 15,300,000
Weighted-average period over which this amount is expected to be recognized (in years)   10 months 24 days      
Employee stock purchase plan issuances (in shares)   155,758 139,211 185,551  
Cash received from the exercise of stock options | $   $ 2,000,000.0      
IRS statutory compensation ceiling | $   $ 350,000      
Executive Equalization Retirement Plan | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award          
Cash awards granted (as percent)   50.00%      
Percentage of incentive cash bonus   100.00%      
Employee Stock Purchase Program          
Share-based Compensation Arrangement by Share-based Payment Award          
Reserved for purchase by plan participants (as percent)   85.00%     85.00%
Employee Stock Purchase Program | Miller Knoll Inc. Employee Stock Purchase Plan          
Share-based Compensation Arrangement by Share-based Payment Award          
Number of shares authorized for issuance (in shares)   5,500,000     5,500,000
Shares available for issuance ( in shares)   1,451,373     1,451,373
Employee Stock Purchase Program | Long Term Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award          
Number of shares authorized for issuance (in shares)   16,464,945     16,464,945
Shares available for issuance ( in shares)   4,875,202     4,875,202
Employee Stock Purchase Program | MillerKnoll, Inc. 2020 Long Term Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award          
Number of shares authorized for issuance (in shares)   7,182,670     7,182,670
Employee Stock Purchase Program | MillerKnoll, Inc. 2023 Long-Term Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award          
Number of shares authorized for issuance (in shares)   9,282,275     9,282,275
Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award          
Weighted-average period over which this amount is expected to be recognized (in years)   11 months 23 days      
Intrinsic value of options exercised | $   $ 700,000 $ 400,000 $ 400,000  
Stock Option | Director          
Share-based Compensation Arrangement by Share-based Payment Award          
Expiration period (in years)   10 years      
Conversion ratio to common stock   1      
Director fees to be paid in form of equity (as percent)         50.00%
Stock Option | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting period (in years)   1 year      
Stock Option | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting period (in years)   3 years      
Expiration period (in years)   10 years      
Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Weighted-average period over which this amount is expected to be recognized (in years)   10 months 6 days      
Vesting period (in years) 3 years 3 years      
Conversion ratio to common stock 1 1      
Fair value of the shares that vested | $   $ 10,000,000.0      
Granted (in dollar per share) | $ / shares   $ 28.24 $ 17.30 $ 27.76  
Weighted-average fair value of restricted stock awards granted (in dollar per share) | $ / shares   $ 25.22 21.92   $ 25.22
Granted (in shares)   1,054,335      
Released (in shares)   337,906      
Restricted Stock Units | After year one          
Share-based Compensation Arrangement by Share-based Payment Award          
Graded vesting (as percent)   33.00%      
Restricted Stock Units | After year two          
Share-based Compensation Arrangement by Share-based Payment Award          
Graded vesting (as percent)   33.00%      
Restricted Stock Units | After year three          
Share-based Compensation Arrangement by Share-based Payment Award          
Graded vesting (as percent)   33.00%      
Performance Share Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Weighted-average period over which this amount is expected to be recognized (in years)   4 months 13 days      
Expiration period (in years) 5 years 3 years      
Conversion ratio to common stock 1 1      
Fair value of the shares that vested | $   $ 2,400,000      
Granted (in dollar per share) | $ / shares   $ 28.04 18.39 $ 27.30  
Total market value of shares released in period | $   $ 15,200      
Weighted-average fair value of restricted stock awards granted (in dollar per share) | $ / shares   $ 25.29 $ 23.91   $ 25.29
Granted (in shares)   355,205      
Released (in shares)   79,937      
Restricted Stock Awards          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting period (in years)   3 years      
Conversion ratio to common stock 1        
Granted (in shares)   0 0 0  
Deferred Stock Units | Director          
Share-based Compensation Arrangement by Share-based Payment Award          
Granted (in dollar per share) | $ / shares   $ 22.79 $ 25.47 $ 22.73  
Granted (in shares)   22,532 16,490 25,230  
Granted (in shares)   22,532      
Released (in shares)   508      
Share-based compensation arrangement by share-based payment award, non-option equity instruments, granted in period, fair value | $   $ 500,000      
Deferred stock units outstanding (in shares)   74,771     74,771
Deferred stock units, vested, aggregate intrinsic fair value | $   $ 1,300,000     $ 1,300,000