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Relationship between Plans Benefit Obligations and Assets (Detail) - Pension Benefits - USD ($) $ in Thousands | May 31, 2020 | May 31, 2019
--- | --- | ---
U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plans with projected benefit obligations in excess of plan assets, benefit obligation | $ 762,739 | $ 660,277
Plans with accumulated benefit obligations in excess of plan assets, benefit obligation | 662,197 | 553,392
Plans with projected benefit obligations in excess of plan assets, plan asset | 516,550 | 496,865
Plans with accumulated benefit obligations in excess of plan assets, plan asset | 516,550 | 496,865
Non-U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plans with projected benefit obligations in excess of plan assets, benefit obligation | 163,589 | 162,824
Plans with accumulated benefit obligations in excess of plan assets, benefit obligation | 150,478 | 149,390
Plans with assets in excess of projected benefit obligations | 46,689 | 43,143
Plans with assets in excess of accumulated benefit obligations | 46,689 | 43,143
Plans with projected benefit obligations in excess of plan assets, plan asset | 134,791 | 134,921
Plans with accumulated benefit obligations in excess of plan assets, plan asset | 134,598 | 134,921
Plans with assets in excess of projected benefit obligations, plan asset | 60,083 | 52,191
Plans with assets in excess of accumulated benefit obligations, plan asset | $ 60,276 | $ 52,191

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