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Pretax Net Actuarial Loss, Prior Service (Cost) and Transition Assets/(Obligation) Recognized in Accumulated Other Comprehensive Income (Loss) not Affecting Retained Earnings, Postretirement (Detail) - Postretirement Benefits - USD ($) $ in Thousands | May 31, 2020 | May 31, 2019
--- | --- | ---
Domestic |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Net actuarial gain (loss) | $ (386) | $ 381
Prior service credits | 448 | 667
Total recognized in accumulated other comprehensive income not affecting retained earnings | 62 | 1,048
Non-U.S. Plans |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Net actuarial gain (loss) | (11,331) | (12,891)
Total recognized in accumulated other comprehensive income not affecting retained earnings | $ (11,331) | $ (12,891)

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