v3.5.0.2
Document and Entity Information - shares
3 Months Ended
Aug. 31, 2016
Sep. 30, 2016
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Aug. 31, 2016  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q1  
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   133,376,742