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Pension Plan Assets Categorized using Fair Value Hierarchy (Detail) (USD $) In Thousands, unless otherwise specified | May 31, 2013 | May 31, 2012 | May 31, 2011
--- | --- | --- | ---
Pension Benefits, Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | $ 155,056 | $ 137,318 | $ 141,639
Pension Benefits, Non-U.S. Plans | Pooled equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 80,550 | 66,212 |
Pension Benefits, Non-U.S. Plans | Pooled fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 46,428 | 43,446 |
Pension Benefits, Non-U.S. Plans | Foreign bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 261 | 433 |
Pension Benefits, Non-U.S. Plans | Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 26,313 | 25,974 |
Pension Benefits, Non-U.S. Plans | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 1,289 | 843 |
Pension Benefits, Non-U.S. Plans | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 215 | 410 |
Pension Benefits, U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 241,960 | 198,208 | 212,215
Pension Benefits, U.S. Plans | Foreign bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 2,342 | 2,279 |
Pension Benefits, U.S. Plans | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 3,848 | 4,549 |
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 | 10,288 | 7,969 |
Pension Benefits, U.S. Plans | State and municipal bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 455 | 490 |
Pension Benefits, U.S. Plans | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 7,332 | 9,169 |
Pension Benefits, U.S. Plans | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 14,550 | 14,647 |
Pension Benefits, U.S. Plans | Stocks-large cap |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 26,443 | 36,196 |
Pension Benefits, U.S. Plans | Stocks-mid cap |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 15,423 | 19,659 |
Pension Benefits, U.S. Plans | Stocks-small cap |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 11,451 | 10,413 |
Pension Benefits, U.S. Plans | Stocks-international |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 2,643 | 6,961 |
Pension Benefits, U.S. Plans | Mutual funds-equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 90,260 | 38,475 |
Pension Benefits, U.S. Plans | Mutual funds-fixed |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 39,080 | 29,806 |
Pension Benefits, U.S. Plans | Limited partnerships |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 1,159 | 1,833 |
Pension Benefits, U.S. Plans | Common/collective trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 16,686 | 15,762 |
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 | 215 | 410 |
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 | 215 | 410 |
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 | 59,808 | 77,778 |
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 | 3,848 | 4,549 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits, U.S. Plans | Stocks-large cap |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 26,443 | 36,196 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits, U.S. Plans | Stocks-mid cap |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 15,423 | 19,659 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits, U.S. Plans | Stocks-small cap |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 11,451 | 10,413 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits, U.S. Plans | Stocks-international |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 2,643 | 6,961 |
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 | 128,528 | 110,934 |
Significant Other Observable Inputs (Level 2) | Pension Benefits, Non-U.S. Plans | Pooled equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 80,550 | 66,212 |
Significant Other Observable Inputs (Level 2) | Pension Benefits, Non-U.S. Plans | Pooled fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 46,428 | 43,446 |
Significant Other Observable Inputs (Level 2) | Pension Benefits, Non-U.S. Plans | Foreign bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 261 | 433 |
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 | 1,289 | 843 |
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 | 164,307 | 102,835 |
Significant Other Observable Inputs (Level 2) | Pension Benefits, U.S. Plans | Foreign bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 2,342 | 2,279 |
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 | 10,288 | 7,969 |
Significant Other Observable Inputs (Level 2) | Pension Benefits, U.S. Plans | State and municipal bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 455 | 490 |
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 | 7,332 | 9,169 |
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 | 14,550 | 14,647 |
Significant Other Observable Inputs (Level 2) | Pension Benefits, U.S. Plans | Mutual funds-equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 90,260 | 38,475 |
Significant Other Observable Inputs (Level 2) | Pension Benefits, U.S. Plans | Mutual funds-fixed |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 39,080 | 29,806 |
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 | 26,313 | 25,974 |
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 | 26,313 | 25,974 |
Significant Unobservable Inputs (Level 3) | Pension Benefits, U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 17,845 | 17,595 |
Significant Unobservable Inputs (Level 3) | Pension Benefits, U.S. Plans | Limited partnerships |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 1,159 | 1,833 |
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 | $ 15,762 |

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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 Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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=21915506&loc=d3e1928-114920 Reference 4: 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=6867990&loc=d3e12355-114930 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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