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Pension Plan Assets Categorized Using Fair Value Hierarchy (Detail) - USD ($) $ in Thousands | May 31, 2017 | May 31, 2016 | May 31, 2015
--- | --- | --- | ---
Pension Benefits, U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | $ 437,481 | $ 314,216 | $ 327,427
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 | 7,923 | 9,533 |
Pension Benefits, U.S. Plans | State and Municipal Debt Obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 628 | 532 |
Pension Benefits, U.S. Plans | Foreign Covered Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 1,623 | 1,095 |
Pension Benefits, U.S. Plans | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 20,211 | 12,289 |
Pension Benefits, U.S. Plans | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 17,976 | 21,035 |
Pension Benefits, U.S. Plans | Large Cap Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 20,999 | 28,686 |
Pension Benefits, U.S. Plans | Mid Cap Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 8,128 | 12,350 |
Pension Benefits, U.S. Plans | Small Cap Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 16,423 | 24,361 |
Pension Benefits, U.S. Plans | International Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 2,639 | 3,538 |
Pension Benefits, U.S. Plans | Equity Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 247,037 | 165,784 |
Pension Benefits, U.S. Plans | Debt Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 34,014 | 27,611 |
Pension Benefits, U.S. Plans | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 59,674 | 7,108 |
Pension Benefits, U.S. Plans | Limited Partner |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 206 | 294 |
Pension Benefits, Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 179,928 | 169,464 | 176,437
Pension Benefits, Non-U.S. Plans | Foreign Covered Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 252 | 231 |
Pension Benefits, Non-U.S. Plans | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 39 | 44 |
Pension Benefits, Non-U.S. Plans | Pooled Equity Securities Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 82,626 | 70,452 |
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 | 65,649 | 67,144 |
Pension Benefits, Non-U.S. Plans | Insurance Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 30,181 | 30,379 |
Pension Benefits, Non-U.S. Plans | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 1,181 | 1,214 |
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 | 107,863 | 76,043 |
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 | 20,999 | 28,686 |
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 | 8,128 | 12,350 |
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 | 16,423 | 24,361 |
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 | 2,639 | 3,538 |
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 | 59,674 | 7,108 |
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 | 39 | 44 |
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 | 39 | 44 |
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 | 329,412 | 237,879 |
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 | 7,923 | 9,533 |
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 | 628 | 532 |
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 | 1,623 | 1,095 |
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 | 20,211 | 12,289 |
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 | 17,976 | 21,035 |
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 | 247,037 | 165,784 |
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 | 34,014 | 27,611 |
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 | 149,708 | 139,041 |
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 | 252 | 231 |
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 | 82,626 | 70,452 |
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 | 65,649 | 67,144 |
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 | 1,181 | 1,214 |
Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 30,387 | 30,673 | $ 31,669
Significant Unobservable Inputs (Level 3) | Pension Benefits, U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 206 | 294 |
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 | 206 | 294 |
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 | 30,181 | 30,379 |
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 | $ 30,181 | $ 30,379 |

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