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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. 27, 2021	Nov. 28, 2020	Nov. 27, 2021	Nov. 28, 2020
Earnings Per Share [Abstract]
Numerator for both basic and diluted EPS, Net (loss) earnings attributable to MillerKnoll, Inc. - in millions	$ (3.4)	$ 51.3	$ (64.9)	$ 124.2
Denominator for basic EPS, weighted-average common shares outstanding (in shares)	75,304,752	58,908,094	70,803,483	58,869,699
Potentially dilutive shares resulting from stock plans (in shares)		359,304	0	174,229
Denominator for diluted EPS (in shares)	75,304,752	59,267,398	70,803,483	59,043,928
Antidilutive equity awards not included in weighted-average common shares - diluted (in shares)	1,518,161	301,002	1,438,374	1,067,979

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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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