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Relationship between Plans Benefit Obligations and Assets (Detail) - Pension Benefits - USD ($) $ in Thousands | May 31, 2019 | May 31, 2018
--- | --- | ---
U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plans with projected benefit obligations in excess of plan assets, benefit obligation | $ 660,277 | $ 617,255
Plans with accumulated benefit obligations in excess of plan assets, benefit obligation | 553,392 | 510,984
Plans with projected benefit obligations in excess of plan assets, plan asset | 496,865 | 487,233
Plans with accumulated benefit obligations in excess of plan assets, plan asset | 496,865 | 487,233
Non-U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plans with projected benefit obligations in excess of plan assets, benefit obligation | 162,824 | 152,533
Plans with accumulated benefit obligations in excess of plan assets, benefit obligation | 149,390 | 43,054
Plans with assets in excess of projected benefit obligations | 43,143 | 41,616
Plans with assets in excess of accumulated benefit obligations | 43,143 | 138,408
Plans with projected benefit obligations in excess of plan assets, plan asset | 134,921 | 136,861
Plans with accumulated benefit obligations in excess of plan assets, plan asset | 134,921 | 29,855
Plans with assets in excess of projected benefit obligations, plan asset | 52,191 | 52,099
Plans with assets in excess of accumulated benefit obligations, plan asset | $ 52,191 | $ 159,105

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