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Relationship between Plans Benefit Obligations and Assets (Detail) - USD ($) $ in Thousands | May. 31, 2015 | May. 31, 2014
--- | --- | ---
Pension Benefits, U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plans with projected benefit obligation in excess of plan assets, benefit obligation | $ 536,365 | $ 476,590
Plans with accumulated benefit obligation in excess of plan assets, benefit obligation | 440,206 | 385,492
Plans with assets in excess of projected benefit obligation | 1,100 |
Plans with assets in excess of accumulated benefit obligation | 1,100 |
Plans with projected benefit obligation in excess of plan assets, plan asset | 326,323 | 282,113
Plans with accumulated benefit obligation in excess of plan assets, plan asset | 326,323 | 282,113
Plans with assets in excess of projected benefit obligation, plan asset | 1,104 |
Plans with assets in excess of accumulated benefit obligation, plan asset | 1,104 |
Pension Benefits, Non-U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plans with projected benefit obligation in excess of plan assets, benefit obligation | 141,149 | 105,327
Plans with accumulated benefit obligation in excess of plan assets, benefit obligation | 47,242 | 103,734
Plans with assets in excess of projected benefit obligation | 50,237 | 96,841
Plans with assets in excess of accumulated benefit obligation | 132,756 | 85,101
Plans with projected benefit obligation in excess of plan assets, plan asset | 124,920 | 80,011
Plans with accumulated benefit obligation in excess of plan assets, plan asset | 33,083 | 80,011
Plans with assets in excess of projected benefit obligation, plan asset | 51,517 | 97,068
Plans with assets in excess of accumulated benefit obligation, plan asset | $ 143,354 | $ 97,068

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