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Stock Repurchase Program - Additional Information (Detail) In Millions, unless otherwise specified | Aug. 31, 2012
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Minimum |
Stock Repurchase Programs [Line Items] |
Shares authorized to be repurchased, per year | 1
Maximum |
Stock Repurchase Programs [Line Items] |
Shares authorized to be repurchased, per year | 2

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