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Contingencies and Other Accrued Losses - Additional Information (Detail) - USD ($) $ in Millions | May 31, 2017 | May 31, 2016
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Commitments And Contingencies Disclosure [Abstract] |  |
Litigation settlement fund | $ 9.3 | $ 9.3

X
- Definition Litigation settlement fund. + References No definition available. + Details
Name: | rpm_LitigationSettlementFund
Namespace Prefix: | rpm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration