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v3.19.2

Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
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May 31, 2019 | May 31, 2018 | May 31, 2017
Statement Of Stockholders Equity [Abstract] |  |  |
Dividends declared and paid paid per share | $ 1.37 | $ 1.26 | $ 1.175

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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_
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Balance Type: | na
Period Type: | duration

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