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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
May 30, 2020
Feb. 29, 2020
Nov. 30, 2019
Aug. 31, 2019
Jun. 01, 2019
Mar. 02, 2019
Dec. 01, 2018
Sep. 01, 2018
Jun. 02, 2018
Mar. 03, 2018
Dec. 02, 2017
Sep. 02, 2017
May 30, 2020
Jun. 01, 2019
Jun. 02, 2018
Quarterly Financial Information Disclosure [Abstract]                              
Net sales $ 475.7 $ 665.7 $ 674.2 $ 670.9 $ 671.0 $ 619.0 $ 652.6 $ 624.6 $ 618.0 $ 578.4 $ 604.6 $ 580.3 $ 2,486.6 $ 2,567.2 $ 2,381.2
Gross margin 165.8 243.3 255.5 246.1 248.2 221.0 235.6 225.1 228.3 205.8 222.1 216.9 910.7 929.9 873.0
Net earnings attributable to Herman Miller, Inc. $ (173.7) $ 37.7 $ 78.6 $ 48.2 $ 46.2 $ 39.2 $ 39.3 $ 35.8 $ 31.8 $ 29.8 $ 33.5 $ 33.1 $ (9.1) $ 160.5 $ 128.1
Earnings per share-basic $ (2.95) $ 0.64 $ 1.33 $ 0.82 $ 0.78 $ 0.67 $ 0.66 $ 0.60 $ 0.53 $ 0.50 $ 0.56 $ 0.55 $ (0.15) $ 2.72 $ 2.15
Earnings per share-diluted $ (2.95) $ 0.64 $ 1.32 $ 0.81 $ 0.78 $ 0.66 $ 0.66 $ 0.60 $ 0.53 $ 0.49 $ 0.55 $ 0.55 $ (0.15) $ 2.70 $ 2.12