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Weighted-Average Actual Target Allocation of Plan Assets (Detail) - Pension Benefits - USD ($) $ in Thousands | May 31, 2019 | May 31, 2018 | May 31, 2017
--- | --- | --- | ---
U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target Allocation |  | 100.00% |  |
Actual Asset Allocation |  | $ 496,865 | $ 487,233 | $ 437,481
Non-U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target Allocation |  | 100.00% |  |
Actual Asset Allocation |  | $ 187,112 | 188,960 | $ 179,928
Equity securities | U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target Allocation |  | 55.00% |  |
Actual Asset Allocation |  | $ 295,100 | 309,300 |
Equity securities | Non-U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target Allocation |  | 41.00% |  |
Actual Asset Allocation |  | $ 79,900 | 90,000 |
Fixed income securities | U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target Allocation |  | 25.00% |  |
Actual Asset Allocation |  | $ 83,800 | 76,500 |
Fixed income securities | Non-U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target Allocation |  | 42.00% |  |
Actual Asset Allocation |  | $ 79,300 | 70,200 |
Multi-class | U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target Allocation |  | 20.00% |  |
Actual Asset Allocation |  | $ 78,100 | 72,800 |
Cash | U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Actual Asset Allocation | [1] | 39,700 | 28,400 |
Cash | Non-U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Actual Asset Allocation |  | 100 | 500 |
Real Estate | U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Actual Asset Allocation |  | $ 200 | 200 |
Real Estate | Non-U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target Allocation |  | 17.00% |  |
Actual Asset Allocation |  | $ 27,800 | $ 28,300 |
[1] | The larger than target cash position at May 31, 2019 results from our February 2019 contribution to the RPM International Inc. Retirement Plan because of our plans to invest the February contribution over a period of time, due to dollar cost averaging.

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