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Changes Recognized in Other Comprehensive Income, Postretirement Benefits (Detail) - Postretirement Benefits - USD ($) $ in Thousands | 12 Months Ended
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May 31, 2020 | May 31, 2019
Domestic |  |
Changes in plan assets and benefit obligations recognized in other comprehensive income: |  |
Net loss (gain) arising during the year | $ 702 | $ (283)
Amounts recognized as a component of net periodic benefit cost: |  |
Amortization or curtailment recognition of prior service credit | 219 | 219
Amortization or settlement recognition of net gain (loss) | 66 | 26
Total recognized in other comprehensive loss (income) | 987 | (38)
Non-U.S. Plans |  |
Changes in plan assets and benefit obligations recognized in other comprehensive income: |  |
Net loss (gain) arising during the year | (683) | 3,801
Effect of exchange rates on amounts included in AOCI | (266) | (419)
Amounts recognized as a component of net periodic benefit cost: |  |
Amortization or settlement recognition of net gain (loss) | (611) | (442)
Total recognized in other comprehensive loss (income) | $ (1,560) | $ 2,940

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