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Stock-Based Compensation (Details)
5 Months Ended 12 Months Ended
Jul. 19, 2021
May 28, 2022
USD ($)
shares
May 28, 2022
USD ($)
$ / shares
shares
May 29, 2021
USD ($)
$ / shares
shares
May 30, 2020
USD ($)
$ / shares
shares
Feb. 10, 2022
shares
Share-based Compensation Arrangement by Share-based Payment Award            
Shares authorized ( in shares) | shares   8,164,945 8,164,945      
Stock-based compensation cost not yet recognized   $ 19,500,000 $ 19,500,000      
Weighted-average period over which this amount is expected to be recognized (in years)     1 year      
Shares of common stock purchased (in shares) | shares     87,562 71,468 70,145  
Cash received from the exercise of stock options     $ 3,100,000      
IRS statutory compensation ceiling     $ 305,000      
Employee stock purchase program            
Share-based Compensation Arrangement by Share-based Payment Award            
Reserved for purchase by plan participants (percentage)   85.00% 85.00%      
Employee stock purchase program expense recognition period     3 months      
Employee 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)     1 year 1 month 24 days      
Intrinsic value of options exercised     $ 1,800,000 $ 500,000 $ 5,500,000  
Employee stock option | Director            
Share-based Compensation Arrangement by Share-based Payment Award            
Vesting period (in years)     1 year      
Expiration period (in years)     10 years      
Conversion ratio to common stock     1      
Director fees to be paid in form of equity (percent)   50.00%        
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)     1 year 3 months 18 days      
Vesting period (in years) 3 years   3 years      
Conversion ratio to common stock 1   1      
Fair value of the shares that vested     $ 19,900,000      
Accelerated vesting, number of shares | shares     11,800,000      
Share-based payment arrangement, cash used to settle award     $ 100,000      
Granted (in usd per share) | $ / shares     $ 44.25 $ 26.71 $ 44.70  
Granted (in shares) | shares     615,867      
Restricted stock units | After year one            
Share-based Compensation Arrangement by Share-based Payment Award            
Graded vesting (percent)     25.00%      
Restricted stock units | After year two            
Share-based Compensation Arrangement by Share-based Payment Award            
Graded vesting (percent)     25.00%      
Restricted stock units | After year three            
Share-based Compensation Arrangement by Share-based Payment Award            
Graded vesting (percent)     50.00%      
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)     9 months      
Expiration period (in years) 5 years   3 years      
Conversion ratio to common stock 1   1      
Fair value of the shares that vested     $ 1,000,000.0      
Granted (in usd per share) | $ / shares     $ 43.06 $ 37.21 $ 45.71  
Accrued cash dividends on the underlying shares of outstanding     $ 100,000      
Granted (in shares) | shares     105,555      
Restricted stock awards            
Share-based Compensation Arrangement by Share-based Payment Award            
Weighted-average period over which this amount is expected to be recognized (in years)     1 year 1 month 6 days      
Vesting period (in years)     3 years      
Conversion ratio to common stock 1          
Fair value of the shares that vested     $ 16,300,000      
Accelerated vesting, number of shares | shares     13,300,000      
Share-based payment arrangement, cash used to settle award     $ 400,000      
Granted (in usd per share) | $ / shares     $ 44.36      
Granted (in shares) | shares     751,907      
Deferred stock units            
Share-based Compensation Arrangement by Share-based Payment Award            
Fair value of the shares that vested     $ 600,000      
Granted (in usd per share) | $ / shares     $ 37.34      
Deferred stock units outstanding (shares) | shares   15,664 15,664      
Deferred stock units, vested, aggregate intrinsic fair value   $ 500,000 $ 500,000      
Deferred stock units | Director            
Share-based Compensation Arrangement by Share-based Payment Award            
Granted (in shares) | shares     15,664 0 0  
Knoll Inc. 2020 Long Term Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award            
Shares authorized ( in shares) | shares         7,182,670  
Knoll Inc. 2021 Stock Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award            
Shares authorized ( in shares) | shares       982,275    
Miller Knoll Inc. Employee Stock Purchase Plan | Employee stock purchase program            
Share-based Compensation Arrangement by Share-based Payment Award            
Shares authorized ( in shares) | shares           4,000,000
Knoll Award | Restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award            
Share-based payment arrangement, cash used to settle award     $ 300,000      
Knoll Award | Restricted stock awards            
Share-based Compensation Arrangement by Share-based Payment Award            
Share-based payment arrangement, cash used to settle award     $ 300,000      
Minimum | Employee stock option            
Share-based Compensation Arrangement by Share-based Payment Award            
Vesting period (in years)     1 year      
Maximum | Employee stock option            
Share-based Compensation Arrangement by Share-based Payment Award            
Vesting period (in years)     3 years      
Expiration period (in years)     10 years      
Maximum | Executive Equalization Retirement Plan            
Share-based Compensation Arrangement by Share-based Payment Award            
Cash awards granted (percent)     50.00%      
Percentage of incentive cash bonus     100.00%