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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 ($)
Jun. 03, 2023
USD ($)
May 29, 2021
USD ($)
Business Acquisition [Line Items]        
Goodwill   $ 1,226.2 $ 1,221.7 $ 364.2
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 (in shares) 0.32      
Business acquisition, share price (in dollar per share) | $ / shares $ 11.00      
Total acquisition date fair value of consideration transferred $ 1,887.3      
Cash payment to acquire equity interest 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 903.5      
Knoll | Knoll        
Business Acquisition [Line Items]        
Goodwill 903.5      
Net decrease to goodwill $ (22.4)