| Cover Document | Mar. 27, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Mar. 27, 2024 |
| Entity Registrant Name | MillerKnoll, Inc. |
| Entity Incorporation, State or Country Code | MI |
| Entity File Number | 001-15141 |
| Entity Tax Identification Number | 38-0837640 |
| Entity Address, Address Line One | 855 East Main Avenue |
| Entity Address, City or Town | Zeeland |
| Entity Address, State or Province | MI |
| Entity Address, Postal Zip Code | 49464 |
| City Area Code | 616 |
| Local Phone Number | 654-3000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.20 per share |
| Trading Symbol | MLKN |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000066382 |
| Amendment Flag | false |
