Document and Entity Information - shares	9 Months Ended
	Feb. 29, 2024	Mar. 27, 2024
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Feb. 29, 2024
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3
Trading Symbol	RPM
Entity Registrant Name	RPM International Inc.
Entity Central Index Key	0000110621
Current Fiscal Year End Date	--05-31
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
Entity Shell Company	false
Entity Bankruptcy Proceedings, Reporting Current	false
Entity File Number	1-14187
Entity Tax Identification Number	02-0642224
Entity Address, Address Line One	2628 PEARL ROAD
Entity Address, City or Town	MEDINA
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	44256
City Area Code	330
Local Phone Number	273-5090
Entity Incorporation, State or Country Code	DE
Document Quarterly Report	true
Document Transition Report	false
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		128,762,983
Title of 12(b) Security	Common Stock, par value $0.01