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Other Expense, Net - Schedule of Other Expense, Net (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 29, 2024 | Feb. 28, 2023 | Feb. 29, 2024 | Feb. 28, 2023
Other Income and Expenses [Abstract] |  |  |  |
Pension non-service costs | $ 2,793 | $ 2,648 | $ 8,359 | $ 7,650
Other | (191) | (309) | (386) | (585)
Other expense, net | $ 2,602 | $ 2,339 | $ 7,973 | $ 7,065

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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
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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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