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Acquisitions and Divestitures - Knoll Acquisition (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Jul. 19, 2021
USD ($)
$ / shares
May 28, 2022
USD ($)
May 29, 2021
USD ($)
May 30, 2020
USD ($)
Business Acquisition [Line Items]        
Goodwill   $ 1,226.2 $ 364.2 $ 346.0
Knoll        
Business Acquisition [Line Items]        
Goodwill   883.6 $ 0.0 $ 0.0
Knoll        
Business Acquisition [Line Items]        
Transaction costs   $ 30.0    
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      
Cash payment to acquire equity interest $ 1,176.6      
Fair value of replacement share awards 53.4      
Outstanding awards of Knoll Restricted Stock and Performance units relating to Knoll Common Stock 22.4      
Amount allocated to future services and to be expensed over remaining service periods 31.0      
Goodwill 903.5      
Knoll | Knoll        
Business Acquisition [Line Items]        
Goodwill 903.5      
Net decrease to goodwill $ (22.4)