Earnings Per Share Earnings Per Share - Schedule of Calculation of Numerator and Denominator in Earnings Per Share (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2019	Dec. 01, 2018	Nov. 30, 2019	Dec. 01, 2018
Earnings Per Share [Abstract]
Numerator for both basic and diluted EPS, Net earnings attributable to Herman Miller, Inc. - in millions	$ 78.6	$ 39.3	$ 126.8	$ 75.1
Denominator for basic EPS, weighted-average common shares outstanding	59,061,731	59,133,700	58,985,366	59,212,370
Potentially dilutive shares resulting from stock plans	340,270	308,519	333,616	399,743
Denominator for diluted EPS	59,402,001	59,442,219	59,318,982	59,612,113
Antidilutive equity awards not included in weighted-average common shares - diluted	86	292,699	43	207,868