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Relationship between Plans Benefit Obligations and Assets (Detail) (USD $) In Thousands, unless otherwise specified | May 31, 2013 | May 31, 2012
--- | --- | ---
Pension Benefits, U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plans with projected benefit obligation in excess of plan assets, benefit obligation | $ 402,686 | $ 385,013
Plans with accumulated benefit obligation in excess of plan assets, benefit obligation | 340,742 | 324,247
Plans with projected benefit obligation in excess of plan assets, plan asset | 241,960 | 198,208
Plans with accumulated benefit obligation in excess of plan assets, plan asset | 241,960 | 198,208
Pension Benefits, Non-U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plans with projected benefit obligation in excess of plan assets, benefit obligation | 185,993 | 174,358
Plans with accumulated benefit obligation in excess of plan assets, benefit obligation | 94,423 | 83,465
Plans with assets in excess of projected benefit obligations, benefit obligation |  | 980
Plans with assets in excess of accumulated benefit obligations, benefit obligation | 79,163 | 73,198
Plans with projected benefit obligation in excess of plan assets, plan asset | 155,056 | 136,296
Plans with accumulated benefit obligation in excess of plan assets, plan asset | 70,642 | 62,902
Plans with assets in excess of projected benefit obligations, plan asset |  | 1,022
Plans with assets in excess of accumulated benefit obligations, plan asset | $ 84,414 | $ 74,416

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