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Cover Page - USD ($)
 12 Months Ended
May 30, 2020
Jul. 22, 2020
Nov. 30, 2019
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date May 30, 2020    
Document Transition Report false    
Entity File Number 001-15141    
Entity Registrant Name HERMAN MILLER, 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 MLHR    
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     $ 2,800,000
Entity Common Stock, Shares Outstanding   58,866,863  
Documents Incorporated by Reference [Text Block]
Certain portions of the Registrant's Proxy Statement for the Annual Meeting of Stockholders expected to be held on October 12, 2020, are incorporated by reference into Part III of this report.
   
Entity Central Index Key 0000066382    
Amendment Flag false    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --05-30