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Stock Repurchase Program - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2014 | Nov. 30, 2014
Stock Repurchase Programs [Line Items] |  |
Authorization of stock repurchase program |  | Jan. 08, 2008
Shares repurchased | 45,000 rpm_RepurchaseOfCommonStockShares |
Shares repurchased, value | $ 1.8 rpm_RepurchaseOfCommonStockValue |
Minimum |  |
Stock Repurchase Programs [Line Items] |  |
Shares authorized to be repurchased, per year | 1,000,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_RangeAxis = us-gaap_MinimumMember | 1,000,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum |  |
Stock Repurchase Programs [Line Items] |  |
Shares authorized to be repurchased, per year | 2,000,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_RangeAxis = us-gaap_MaximumMember | 2,000,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_RangeAxis = us-gaap_MaximumMember

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- 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

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- Definition Repurchase of Common Stock, Value + References No definition available. + Details
Name: | rpm_RepurchaseOfCommonStockValue
Namespace Prefix: | rpm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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

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

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- 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

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |