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Cover Page - USD ($)
$ in Billions
 12 Months Ended
May 29, 2021
Jul. 18, 2021
Nov. 27, 2020
Cover [Abstract]      
Document Type 10-K/A    
Document Annual Report true    
Document Period End Date May 29, 2021    
Current Fiscal Year End Date --05-29    
Document Transition Report false    
Entity File Number 001-15141    
Entity Registrant Name MillerKnoll, Inc.    
Entity Incorporation, State or Country Code MI    
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    
Title of 12(b) Security Common Stock    
Trading Symbol MLKN    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 2.2
Entity Common Stock, Shares Outstanding   59,052,202  
Documents Incorporated by Reference [Text Block] Certain portions of the Registrant's Proxy Statement for the 2021 Annual Meeting of Stockholders are incorporated by reference into Part III of this report.    
Entity Central Index Key 0000066382    
Amendment Flag true    
Amendment Description EXPLANATORY NOTEMillerKnoll, Inc. (the “Company”) is filing this Amendment No. 1 to its Annual Report on Form 10-K for the fiscal year ended May 29, 2021, previously filed with the Securities and Exchange Commission (“SEC”) on July 27, 2021 (the “Original Filing”), to make certain corrections to the Report of Independent Registered Public Accounting Firm of Ernst & Young LLP included within the Original Filing (the “Original Report”). The Original Report inadvertently contained typographical errors such that the Original Report, as filed, did not conform to the report provided by Ernst & Young LLP. Because the Original Report was included within Item 8 of the Original Filing, this Amendment No. 1 sets forth the complete text of Item 8, as required by SEC Rule 12b-15; however, except for the corrections made to the Original Report noted above, no revisions or modifications have been made to the financial statements or any other information contained within Item 8 of the Original Filing. Effective November 1, 2021, the Company’s name changed from Herman Miller, Inc. to MillerKnoll, Inc., and the Company’s trading symbol changed from MLHR to MLKN. The Company’s current name and trading symbol have been used where appropriate within this Amendment No. 1, including on the cover page.Except as described above, this Amendment No. 1 does not amend, update, or change any other items or disclosures contained in the Original Filing. Except for certain changes to reflect the Company’s current name and trading symbol, as described above, this Amendment No. 1 does not reflect or purport to reflect any information or events occurring after the date of the Original Filing nor does it modify or update the disclosures contained in the Original Filing that may be or have been affected by subsequent events. Accordingly, this Amendment No. 1 should be read in conjunction with the Original Filing and the Company’s other filings made with the SEC subsequent to the filing of the Original Filing.    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY