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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		9 Months Ended
	Feb. 26, 2022	Feb. 27, 2021	Feb. 26, 2022	Feb. 27, 2021
Earnings Per Share [Abstract]
Numerator for both basic and diluted EPS, Net earnings (loss) attributable to MillerKnoll, Inc. - in millions	$ 12.6	$ 41.5	$ (52.3)	$ 165.7
Denominator for basic EPS, weighted-average common shares outstanding (in shares)	75,461,462	58,979,730	72,356,143	58,906,376
Potentially dilutive shares resulting from stock plans (in shares)	1,049,972	622,908	0	306,071
Denominator for diluted EPS (in shares)	76,511,434	59,602,638	72,356,143	59,212,447
Antidilutive equity awards not included in weighted-average common shares - diluted (in shares)	307,218	128,046	1,320,891	314,293

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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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