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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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