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Stock Repurchase Program - Additional Information (Detail) | 3 Months Ended
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Aug. 31, 2014
Stock Repurchase Programs [Line Items] |
Authorization of stock repurchase program | Jan. 08, 2008
Shares repurchased | 0
Minimum |
Stock Repurchase Programs [Line Items] |
Shares authorized to be repurchased, per year | 1,000,000
Maximum |
Stock Repurchase Programs [Line Items] |
Shares authorized to be repurchased, per year | 2,000,000

X
- Definition Repurchase of Common Stock, Shares + References No definition available. + Details
Name: | rpm_RepurchaseOfCommonStockShares
Namespace Prefix: | rpm_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Shares Repurchased Authorization Date + References No definition available. + Details
Name: | rpm_SharesRepurchasedAuthorizationDate
Namespace Prefix: | rpm_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | rpm_StockRepurchaseProgramsLineItems
Namespace Prefix: | rpm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant