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Significant Accounting and Reporting Policies - Schedule of Consolidated Statements of Comprehensive Income (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
May 28, 2022
Feb. 26, 2022
Nov. 27, 2021
Aug. 28, 2021
May 29, 2021
Feb. 27, 2021
Nov. 28, 2020
Aug. 29, 2020
May 30, 2020
Feb. 29, 2020
Nov. 30, 2019
Aug. 31, 2019
May 28, 2022
May 29, 2021
May 30, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                              
Cost of sales                         $ 2,593.3 $ 1,514.0 $ 1,575.4
(Loss) earnings before income taxes                         (8.6) 228.3 (12.9)
Income tax expense                         11.1 48.3 6.1
Net (loss) earnings                         (19.7) 180.3 (14.0)
Net (loss) earnings attributable to MillerKnoll, Inc. $ 21.5 $ 14.4 $ (1.7) $ (61.3) $ 8.9 $ 41.5 $ 51.4 $ 72.8 $ (173.6) $ 37.9 $ 78.7 $ 48.3 $ (27.1) $ 174.6 $ (8.7)
Earnings (loss) per share - basic (in usd per share) $ 0.28 $ 0.19 $ (0.02) $ (0.92) $ 0.15 $ 0.70 $ 0.87 $ 1.24 $ (2.94) $ 0.64 $ 1.33 $ 0.82 $ (0.37) $ 2.96 $ (0.15)
Earnings (loss) per share - diluted (in usd per share) $ 0.28 $ 0.19 $ (0.02) $ (0.92) $ 0.15 $ 0.70 $ 0.86 $ 1.23 $ (2.94) $ 0.64 $ 1.32 $ 0.81 $ (0.37) $ 2.94 $ (0.15)
If Reported using LIFO                              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                              
Cost of sales                           $ 1,515.9 $ 1,575.9
(Loss) earnings before income taxes                           226.4 (13.4)
Income tax expense                           47.9 6.0
Net (loss) earnings                           178.8 (14.4)
Net (loss) earnings attributable to MillerKnoll, Inc.                           $ 173.1 $ (9.1)
Earnings (loss) per share - basic (in usd per share)                           $ 2.94 $ (0.15)
Earnings (loss) per share - diluted (in usd per share)                           $ 2.92 $ (0.15)
Impact of change to FIFO                              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                              
Cost of sales                         $ (10.6) $ (1.9) $ (0.5)
(Loss) earnings before income taxes                         10.6 1.9 0.5
Income tax expense                         2.2 0.4 0.1
Net (loss) earnings                         8.4 1.5 0.4
Net (loss) earnings attributable to MillerKnoll, Inc.                         $ 8.4 $ 1.5 $ 0.4
Earnings (loss) per share - basic (in usd per share)                         $ 0.12 $ 0.02 $ 0
Earnings (loss) per share - diluted (in usd per share)                         $ 0.12 $ 0.02 $ 0
If Reported using LIFO                              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                              
Cost of sales                         $ 2,603.9    
(Loss) earnings before income taxes                         (19.2)    
Income tax expense                         8.9    
Net (loss) earnings                         (28.1)    
Net (loss) earnings attributable to MillerKnoll, Inc.                         $ (35.5)    
Earnings (loss) per share - basic (in usd per share)                         $ (0.49)    
Earnings (loss) per share - diluted (in usd per share)                         $ (0.49)