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Activity that Occurred for Level Three Assets (Detail) - Significant Unobservable Inputs (Level 3) - Pension Benefits - USD ($) $ in Thousands | 12 Months Ended
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May 31, 2020 | May 31, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |
Balance at Beginning of Period |  | $ 28,015 | $ 28,448
Actual Return on Plan Assets For Assets Still Held at Reporting Date |  | (691) | 1,228
Settlements | [1] | 113 | (1,661)
Balance at End of Period |  | $ 27,437 | $ 28,015
[1] | Includes the impact of exchange rate changes during the year.

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