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Acquisitions - Additional Information (Details) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
	Jul. 19, 2021 USD ($) $ / shares	Nov. 27, 2021 USD ($)	Nov. 28, 2020 USD ($)	Nov. 27, 2021 USD ($)	Nov. 28, 2020 USD ($)	May 29, 2021 USD ($)
Business Acquisition [Line Items]
Goodwill		$ 1,284.5		$ 1,284.5		$ 364.2
Net sales		1,026.3	$ 626.3	1,816.0	$ 1,253.0
Operating (loss) earnings		3.8	71.0	(49.0)	166.4
Knoll
Business Acquisition [Line Items]
Operating (loss) earnings		(20.6)	$ 0.0	(74.4)	$ 0.0
Knoll
Business Acquisition [Line Items]
Transaction costs		0.9		$ 27.6
Number of shares of Herman Miller, Inc. (now MillerKnoll, Inc.) stock to be issued for each issued and outstanding share of Knoll	0.32
Business acquisition, share price (in dollar per share) | $ / shares	$ 11.00
Aggregate cash paid to acquire business	$ 1,176.6
Fair value of replacement share awards	53.4
Amount preliminarily allocated to purchase price	22.4
Amount allocated to future services and to be expensed over remaining service periods	31.0
Goodwill	943.7
Knoll | Knoll
Business Acquisition [Line Items]
Goodwill	$ 943.7
Goodwill, period increase (decrease)		$ 17.8

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