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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. 28, 2021	Aug. 29, 2020
Earnings Per Share [Abstract]
Numerator for both basic and diluted EPS, Net earnings attributable to Herman Miller, Inc. - in millions	$ (61.5)	$ 73.0
Denominator for basic EPS, weighted-average common shares outstanding (in shares)	66,302,214	58,831,305
Potentially dilutive shares resulting from stock plans (in shares)	0	132,963
Denominator for diluted EPS (in shares)	66,302,214	58,964,268
Antidilutive equity awards not included in weighted-average common shares - diluted (in shares)	1,328,275	1,096,907

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