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Other (Income) Expense, Net - Schedule of Other (Income) Expense, Net (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Aug. 31, 2024 | Aug. 31, 2023
Other Income and Expenses [Abstract] |  |
Pension non-service (credits) costs | $ (27) | $ 2,781
Other | (507) | (227)
Other (income) expense, net | $ (534) | $ 2,554

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- Definition Other income (expense). + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Pension non-service (credits)/costs. + References No definition available. + Details
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Namespace Prefix: | rpm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition Amount of income (expense) related to nonoperating activities, classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(9)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
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