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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		6 Months Ended
	Nov. 28, 2020	Nov. 30, 2019	Nov. 28, 2020	Nov. 30, 2019
Earnings Per Share [Abstract]
Numerator for both basic and diluted EPS, Net earnings attributable to Herman Miller, Inc. - in millions	$ 51.3	$ 78.6	$ 124.2	$ 126.8
Denominator for basic EPS, weighted-average common shares outstanding	58,908,094	59,061,731	58,869,699	58,985,366
Potentially dilutive shares resulting from stock plans	359,304	340,270	174,229	333,616
Denominator for diluted EPS	59,267,398	59,402,001	59,043,928	59,318,982
Antidilutive equity awards not included in weighted-average common shares - diluted	301,002	86	1,067,979	43

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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