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Common Stock and Per Share Information - Schedule of Calculation of Numerator and Denominator in Earnings Per Share (Details) - USD ($) $ in Millions	3 Months Ended												12 Months Ended
	May 28, 2022	Feb. 26, 2022	Nov. 27, 2021	Aug. 28, 2021	May 29, 2021	Feb. 27, 2021	Nov. 28, 2020	Aug. 29, 2020	May 30, 2020	Feb. 29, 2020	Nov. 30, 2019	Aug. 31, 2019	May 28, 2022	May 29, 2021	May 30, 2020
Numerator:
Numerator for both basic and diluted EPS, Net (loss) earnings attributable to MillerKnoll, Inc.	$ 21.5	$ 14.4	$ (1.7)	$ (61.3)	$ 8.9	$ 41.5	$ 51.4	$ 72.8	$ (173.6)	$ 37.9	$ 78.7	$ 48.3	$ (27.1)	$ 174.6	$ (8.7)
Denominator:
Denominator for basic EPS, weighted-average common shares outstanding													73,160,212	58,931,268	58,920,653
Potentially dilutive shares resulting from stock plans													0	458,330	0
Denominator for diluted EPS													73,160,212	59,389,598	58,920,653

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