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Document and Entity Information - USD ($)
 12 Months Ended
May 31, 2020
Jul. 23, 2020
Nov. 30, 2019
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date May 31, 2020    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Trading Symbol RPM    
Entity Registrant Name RPM INTERNATIONAL INC.    
Entity Central Index Key 0000110621    
Current Fiscal Year End Date --05-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   129,859,093  
Entity Public Float     $ 9,456,281,333
Entity File Number 1-14187    
Entity Tax Identification Number 02-0642224    
Entity Address, Address Line One P.O. Box 777    
Entity Address, Address Line Two 2628 Pearl Road    
Entity Address, City or Town Medina    
Entity Address, State or Province OH    
Entity Address, Postal Zip Code 44258    
City Area Code 330    
Local Phone Number 273-5090    
Entity Incorporation, State or Country Code DE    
Document Annual Report true    
Document Transition Report false    
Security Exchange Name NYSE    
Title of 12(b) Security Common Stock, par value $0.01    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the definitive Proxy Statement to be used in connection with the Registrant’s Annual Meeting of Stockholders to be held on October 8, 2020 (the “2020 Proxy Statement”) are incorporated by reference into Part III of this Annual Report on Form 10-K.

Except as otherwise stated, the information contained in this Annual Report on Form 10-K is as of May 31, 2020.