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Fair Value Measurements Fair Value Measurements - Redeemable Noncontrolling Interests (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 29, 2020
Aug. 31, 2019
Redeemable Noncontrolling Interest [Line Items]    
Net income attributable to redeemable noncontrolling interests $ 0.4 $ (0.2)
Redeemable Noncontrolling Interests, Ending 57.2  
Payments to Acquire Additional Interest in Subsidiaries 0.0 19.8
HAY    
Redeemable Noncontrolling Interest [Line Items]    
Redeemable Noncontrolling Interests, Beginning 50.4  
Net income attributable to redeemable noncontrolling interests 0.4  
Cumulative translation adjustments attributable to redeemable noncontrolling interests 2.6  
Foreign currency translation adjustments 3.8  
Redeemable Noncontrolling Interests, Ending $ 57.2  
Herman Miller Consumer Holdings [Member]    
Redeemable Noncontrolling Interest [Line Items]    
Payments to Acquire Additional Interest in Subsidiaries   $ 20.4