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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, 2019 | May 31, 2018
Domestic |  |
Changes in plan assets and benefit obligations recognized in other comprehensive income: |  |
Net loss (gain) arising during the year | $ (283) | $ (400)
Amounts recognized as a component of net periodic benefit cost: |  |
Amortization or curtailment recognition of prior service credit (cost) | 219 | 220
Amortization or settlement recognition of net gain (loss) | 26 | (24)
Total recognized in other comprehensive loss (income) | (38) | (204)
Non-U.S. Plans |  |
Changes in plan assets and benefit obligations recognized in other comprehensive income: |  |
Net loss (gain) arising during the year | 3,801 | 2,638
Effect of exchange rates on amounts included in AOCI | (419) | 291
Amounts recognized as a component of net periodic benefit cost: |  |
Amortization or settlement recognition of net gain (loss) | (442) | (332)
Total recognized in other comprehensive loss (income) | $ 2,940 | $ 2,597

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