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Relationship between Plans Benefit Obligations and Assets (Detail) (USD $) In Thousands, unless otherwise specified | May 31, 2014 | May 31, 2013
--- | --- | ---
Pension Benefits, U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plans with projected benefit obligation in excess of plan assets, benefit obligation | $ 476,590 | $ 402,686
Plans with accumulated benefit obligation in excess of plan assets, benefit obligation | 385,492 | 340,742
Plans with projected benefit obligation in excess of plan assets, plan asset | 282,113 | 241,960
Plans with accumulated benefit obligation in excess of plan assets, plan asset | 282,113 | 241,960
Pension Benefits, Non-U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plans with projected benefit obligation in excess of plan assets, benefit obligation | 105,327 | 185,993
Plans with accumulated benefit obligation in excess of plan assets, benefit obligation | 103,734 | 94,423
Plans with assets in excess of projected benefit obligations, benefit obligation | 96,841 |
Plans with assets in excess of accumulated benefit obligations, benefit obligation | 85,101 | 79,163
Plans with projected benefit obligation in excess of plan assets, plan asset | 80,011 | 155,056
Plans with accumulated benefit obligation in excess of plan assets, plan asset | 80,011 | 70,642
Plans with assets in excess of projected benefit obligations, plan asset | 97,068 |
Plans with assets in excess of accumulated benefit obligations, plan asset | $ 97,068 | $ 84,414

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