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v3.25.2

Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
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May 31, 2025 | May 31, 2024 | May 31, 2023
Statement of Stockholders' Equity [Abstract] |  |  |
Dividends declared and paid per share | $ 1.99 | $ 1.8 | $ 1.66

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- Definition Common stock dividends declared and paid per share. + References No definition available. + Details
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Namespace Prefix: | rpm_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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