Earnings Per Share Earnings Per Share - Schedule of Calculation of Numerator and Denominator in Earnings Per Share (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 27, 2021	Feb. 29, 2020	Feb. 27, 2021	Feb. 29, 2020
Earnings Per Share [Abstract]
Numerator for both basic and diluted EPS, Net earnings attributable to Herman Miller, Inc. - in millions	$ 41.5	$ 37.7	$ 165.7	$ 164.5
Denominator for basic EPS, weighted-average common shares outstanding	58,979,730	58,940,060	58,906,376	58,970,264
Potentially dilutive shares resulting from stock plans	622,908	278,041	306,071	296,665
Denominator for diluted EPS	59,602,638	59,218,101	59,212,447	59,266,929
Antidilutive equity awards not included in weighted-average common shares - diluted	128,046	164,443	314,293	74,932