Document and Entity Information	9 Months Ended
	Feb. 28, 2015	Apr. 03, 2015
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Feb. 28, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
Trading Symbol	RPM
Entity Registrant Name	RPM INTERNATIONAL INC/DE/
Entity Central Index Key	0000110621
Current Fiscal Year End Date	--05-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		133,221,507