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Pension Plan Assets Categorized Using Fair Value Hierarchy (Detail) - USD ($) $ in Thousands | May 31, 2016 | May 31, 2015 | May 31, 2014
--- | --- | --- | ---
Pension Benefits, U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | $ 314,216 | $ 327,427 | $ 282,113
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 | 9,533 | 9,245 |
Pension Benefits, U.S. Plans | State and Municipal Debt Obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 532 | 461 |
Pension Benefits, U.S. Plans | Foreign Covered Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 1,095 | 2,608 |
Pension Benefits, U.S. Plans | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 12,289 | 11,536 |
Pension Benefits, U.S. Plans | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 21,035 | 17,894 |
Pension Benefits, U.S. Plans | Large Cap Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 28,686 | 36,554 |
Pension Benefits, U.S. Plans | Mid Cap Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 12,350 | 14,575 |
Pension Benefits, U.S. Plans | Small Cap Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 24,361 | 20,175 |
Pension Benefits, U.S. Plans | International Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 3,538 | 3,756 |
Pension Benefits, U.S. Plans | Equity Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 165,784 | 148,207 |
Pension Benefits, U.S. Plans | Debt Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 27,611 | 54,112 |
Pension Benefits, U.S. Plans | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 7,108 | 8,019 |
Pension Benefits, U.S. Plans | Limited Partner |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 294 | 285 |
Pension Benefits, Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 169,464 | 176,437 | 177,079
Pension Benefits, Non-U.S. Plans | Foreign Covered Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 231 | 195 |
Pension Benefits, Non-U.S. Plans | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 44 | 424 |
Pension Benefits, Non-U.S. Plans | Pooled Equity Securities Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 70,452 | 74,159 |
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 | 67,144 | 68,773 |
Pension Benefits, Non-U.S. Plans | Insurance Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 30,379 | 31,384 |
Pension Benefits, Non-U.S. Plans | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 1,214 | 1,502 |
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 | 76,043 | 83,079 |
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 | 28,686 | 36,554 |
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 | 12,350 | 14,575 |
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 | 24,361 | 20,175 |
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 | 3,538 | 3,756 |
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 | 7,108 | 8,019 |
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 | 44 | 424 |
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 | 44 | 424 |
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 | 237,879 | 244,063 |
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 | 9,533 | 9,245 |
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 | 532 | 461 |
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 | 1,095 | 2,608 |
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 | 12,289 | 11,536 |
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 | 21,035 | 17,894 |
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 | 165,784 | 148,207 |
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 | 27,611 | 54,112 |
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 | 139,041 | 144,629 |
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 | 231 | 195 |
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 | 70,452 | 74,159 |
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 | 67,144 | 68,773 |
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 | 1,214 | 1,502 |
Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 30,673 | 31,669 | $ 29,568
Significant Unobservable Inputs (Level 3) | Pension Benefits, U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 294 | 285 |
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 | 294 | 285 |
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 | 30,379 | 31,384 |
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 | $ 30,379 | $ 31,384 |

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