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Acquisitions and Divestitures - Additional Information (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Jan. 31, 2022
USD ($)
Jul. 19, 2021
USD ($)
$ / shares
Feb. 26, 2022
USD ($)
Feb. 26, 2022
USD ($)
Feb. 27, 2021
USD ($)
May 29, 2021
USD ($)
Business Acquisition [Line Items]            
Goodwill     $ 1,282.7 $ 1,282.7   $ 364.2
CANADA | Wholly Owned Contract Furniture Dealership            
Business Acquisition [Line Items]            
Proceeds from divestiture of businesses $ 2.8          
Gain (loss) on disposition of business         $ 2.0  
Knoll            
Business Acquisition [Line Items]            
Transaction costs     1.2 $ 28.8    
Number of shares of Herman Miller, Inc. (now MillerKnoll, Inc.) stock to be issued for each issued and outstanding share of Knoll   0.32        
Business acquisition, share price (in dollar per share) | $ / shares   $ 11.00        
Total preliminary acquisition date fair value of consideration transferred   $ 1,887.3        
Aggregate cash paid to acquire business   1,176.6        
Fair value of replacement share awards   53.4        
Amount preliminarily allocated to purchase price   22.4        
Amount allocated to future services and to be expensed over remaining service periods   31.0        
Goodwill   941.4        
Knoll | Knoll            
Business Acquisition [Line Items]            
Goodwill   $ 941.4        
Net decrease to goodwill     $ 2.3