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Earnings Per Share Earnings Per Share - Schedule of Calculation of Numerator and Denominator in Earnings Per Share (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 29, 2020	Aug. 31, 2019
Earnings Per Share [Abstract]
Numerator for both basic and diluted EPS, Net earnings attributable to Herman Miller, Inc. - in millions	$ 73.0	$ 48.2
Denominator for basic EPS, weighted-average common shares outstanding	58,831,305	58,909,001
Potentially dilutive shares resulting from stock plans	132,963	322,727
Denominator for diluted EPS	58,964,268	59,231,728
Antidilutive equity awards not included in weighted-average common shares - diluted	1,096,907	123,088

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