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Pretax Net Actuarial Loss and Prior Service (Costs) Recognized in Accumulated Other Comprehensive Income (Loss) not Affecting Retained Earnings,Pension (Detail) - Pension Benefits - USD ($) $ in Thousands | May 31, 2020 | May 31, 2019
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U.S. Plans |  |
Schedule of Net Periodic Benefit Costs and Assumptions for Defined Benefit Postretirement Plans [Line Items] |  |
Net actuarial loss | $ (341,179) | $ (250,286)
Prior service (costs) credits | (20) | (28)
Total recognized in accumulated other comprehensive income not affecting retained earnings | (341,199) | (250,314)
Non-U.S. Plans |  |
Schedule of Net Periodic Benefit Costs and Assumptions for Defined Benefit Postretirement Plans [Line Items] |  |
Net actuarial loss | (48,090) | (51,184)
Prior service (costs) credits | 1,098 | 224
Total recognized in accumulated other comprehensive income not affecting retained earnings | $ (46,992) | $ (50,960)

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