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Relationship between Plans Benefit Obligations and Assets (Detail) - USD ($) $ in Thousands | May 31, 2016 | May 31, 2015
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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 | $ 589,046 | $ 536,365
Plans with accumulated benefit obligations in excess of plan assets, benefit obligation | 483,944 | 440,206
Plans with assets in excess of projected benefit obligations |  | 1,100
Plans with assets in excess of accumulated benefit obligations |  | 1,100
Plans with projected benefit obligations in excess of plan assets, plan asset | 314,216 | 326,323
Plans with accumulated benefit obligations in excess of plan assets, plan asset | 314,216 | 326,323
Plans with assets in excess of projected benefit obligations, plan asset |  | 1,104
Plans with assets in excess of accumulated benefit obligations, plan asset |  | 1,104
Pension Benefits, Non-U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plans with projected benefit obligations in excess of plan assets, benefit obligation | 141,627 | 141,149
Plans with accumulated benefit obligations in excess of plan assets, benefit obligation | 46,464 | 47,242
Plans with assets in excess of projected benefit obligations | 45,437 | 50,237
Plans with assets in excess of accumulated benefit obligations | 128,930 | 132,756
Plans with projected benefit obligations in excess of plan assets, plan asset | 119,730 | 124,920
Plans with accumulated benefit obligations in excess of plan assets, plan asset | 31,868 | 33,083
Plans with assets in excess of projected benefit obligations, plan asset | 49,734 | 51,517
Plans with assets in excess of accumulated benefit obligations, plan asset | $ 137,596 | $ 143,354

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