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Contingencies and Other Accrued Losses - Additional Information (Detail) $ in Millions | 9 Months Ended
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Feb. 29, 2020 USD ($)
Carboline Company |
Loss Contingencies [Line Items] |
Litigation settlement amount | $ 1.3

X
- Definition Amount awarded to other party in judgment or settlement of litigation. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=rpm_CarbolineCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |