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Acquisitions - Schedule of Business Acquisition, Pro Forma Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Nov. 27, 2021 | Nov. 28, 2020 | Nov. 27, 2021 | Nov. 28, 2020
Business Combination and Asset Acquisition [Abstract] |  |  |  |
Net sales | $ 1,026.3 | $ 940.5 | $ 1,970.2 | $ 1,832.3
Net earnings attributable to MillerKnoll, Inc. | $ 8.2 | $ 58.4 | $ (22.6) | $ 110.3

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