v3.7.0.1
Document and Entity Information - shares
9 Months Ended
Feb. 28, 2017
Apr. 03, 2017
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Feb. 28, 2017  
Document Fiscal Year Focus 2017  
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   133,573,447