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Consolidation, Noncontrolling Interests and Basis of Presentation - Additional Information (Detail) | Aug. 31, 2019
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Accounting Policies [Abstract] |
Percentage of controlled subsidiary's earnings | 100.00%

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- Definition Percentage of subsidiary earnings included in consolidation. + References No definition available. + Details
Name: | rpm_PercentageOfSubsidiaryEarningsIncludedInConsolidation
Namespace Prefix: | rpm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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