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Pension Plan Assets Categorized using Fair Value Hierarchy (Detail) (USD $) In Thousands, unless otherwise specified | May 31, 2014 | May 31, 2013 | May 31, 2012
--- | --- | --- | ---
Pension Benefits, U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | $ 282,113 | $ 241,960 | $ 198,208
Pension Benefits, U.S. Plans | U.S. Treasury and other government |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 11,203 | 10,288 |
Pension Benefits, U.S. Plans | State and Municipal Debt Obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 456 | 455 |
Pension Benefits, U.S. Plans | Foreign Covered Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 1,264 | 2,342 |
Pension Benefits, U.S. Plans | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 7,255 | 7,332 |
Pension Benefits, U.S. Plans | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 17,254 | 14,550 |
Pension Benefits, U.S. Plans | Large Cap Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 34,442 | 26,443 |
Pension Benefits, U.S. Plans | Mid Cap Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 18,183 | 15,423 |
Pension Benefits, U.S. Plans | Small Cap Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 12,145 | 11,451 |
Pension Benefits, U.S. Plans | International Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 2,525 | 2,643 |
Pension Benefits, U.S. Plans | Equity Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 126,513 | 90,260 |
Pension Benefits, U.S. Plans | Debt Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 44,094 | 39,080 |
Pension Benefits, U.S. Plans | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 5,869 | 3,848 |
Pension Benefits, U.S. Plans | Limited Partner |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 910 | 1,159 |
Pension Benefits, U.S. Plans | Common Collective Trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 16,686 |
Pension Benefits, Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 177,079 | 155,056 | 137,318
Pension Benefits, Non-U.S. Plans | Foreign Covered Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 210 | 261 |
Pension Benefits, Non-U.S. Plans | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 572 | 215 |
Pension Benefits, Non-U.S. Plans | Pooled Equity Securities Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 82,534 | 80,550 |
Pension Benefits, Non-U.S. Plans | Pooled Funds Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 63,657 | 46,428 |
Pension Benefits, Non-U.S. Plans | Insurance Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 28,658 | 26,313 |
Pension Benefits, Non-U.S. Plans | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 1,448 | 1,289 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits, U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 73,164 | 59,808 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits, U.S. Plans | Large Cap Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 34,442 | 26,443 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits, U.S. Plans | Mid Cap Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 18,183 | 15,423 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits, U.S. Plans | Small Cap Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 12,145 | 11,451 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits, U.S. Plans | International Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 2,525 | 2,643 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits, U.S. Plans | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 5,869 | 3,848 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits, Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 572 | 215 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits, Non-U.S. Plans | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 572 | 215 |
Significant Other Observable Inputs (Level 2) | Pension Benefits, U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 208,039 | 164,307 |
Significant Other Observable Inputs (Level 2) | Pension Benefits, U.S. Plans | U.S. Treasury and other government |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 11,203 | 10,288 |
Significant Other Observable Inputs (Level 2) | Pension Benefits, U.S. Plans | State and Municipal Debt Obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 456 | 455 |
Significant Other Observable Inputs (Level 2) | Pension Benefits, U.S. Plans | Foreign Covered Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 1,264 | 2,342 |
Significant Other Observable Inputs (Level 2) | Pension Benefits, U.S. Plans | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 7,255 | 7,332 |
Significant Other Observable Inputs (Level 2) | Pension Benefits, U.S. Plans | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 17,254 | 14,550 |
Significant Other Observable Inputs (Level 2) | Pension Benefits, U.S. Plans | Equity Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 126,513 | 90,260 |
Significant Other Observable Inputs (Level 2) | Pension Benefits, U.S. Plans | Debt Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 44,094 | 39,080 |
Significant Other Observable Inputs (Level 2) | Pension Benefits, Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 147,849 | 128,528 |
Significant Other Observable Inputs (Level 2) | Pension Benefits, Non-U.S. Plans | Foreign Covered Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 210 | 261 |
Significant Other Observable Inputs (Level 2) | Pension Benefits, Non-U.S. Plans | Pooled Equity Securities Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 82,534 | 80,550 |
Significant Other Observable Inputs (Level 2) | Pension Benefits, Non-U.S. Plans | Pooled Funds Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 63,657 | 46,428 |
Significant Other Observable Inputs (Level 2) | Pension Benefits, Non-U.S. Plans | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 1,448 | 1,289 |
Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 29,568 | 44,158 | 43,569
Significant Unobservable Inputs (Level 3) | Pension Benefits, U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 910 | 17,845 |
Significant Unobservable Inputs (Level 3) | Pension Benefits, U.S. Plans | Limited Partner |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 910 | 1,159 |
Significant Unobservable Inputs (Level 3) | Pension Benefits, U.S. Plans | Common Collective Trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 16,686 |
Significant Unobservable Inputs (Level 3) | Pension Benefits, Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 28,658 | 26,313 |
Significant Unobservable Inputs (Level 3) | Pension Benefits, Non-U.S. Plans | Insurance Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | $ 28,658 | $ 26,313 |

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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