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Relationship between Plans Benefit Obligations and Assets (Detail) - USD ($) $ in Thousands | May 31, 2017 | May 31, 2016
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Pension Benefits, U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plans with projected benefit obligations in excess of plan assets, benefit obligation | $ 591,948 | $ 589,046
Plans with accumulated benefit obligations in excess of plan assets, benefit obligation | 489,918 | 483,944
Plans with projected benefit obligations in excess of plan assets, plan asset | 437,481 | 314,216
Plans with accumulated benefit obligations in excess of plan assets, plan asset | 437,481 | 314,216
Pension Benefits, Non-U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plans with projected benefit obligations in excess of plan assets, benefit obligation | 147,560 | 141,627
Plans with accumulated benefit obligations in excess of plan assets, benefit obligation | 44,797 | 46,464
Plans with assets in excess of projected benefit obligations | 48,324 | 45,437
Plans with assets in excess of accumulated benefit obligations | 138,241 | 128,930
Plans with projected benefit obligations in excess of plan assets, plan asset | 130,605 | 119,730
Plans with accumulated benefit obligations in excess of plan assets, plan asset | 31,653 | 31,868
Plans with assets in excess of projected benefit obligations, plan asset | 49,323 | 49,734
Plans with assets in excess of accumulated benefit obligations, plan asset | $ 148,275 | $ 137,596

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