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Pension Plan Assets Categorized Using Fair Value Hierarchy (Detail) - Pension Benefits - USD ($) $ in Thousands | May 31, 2019 | May 31, 2018 | May 31, 2017
--- | --- | --- | ---
U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | $ 496,865 | $ 487,233 | $ 437,481
U.S. Plans | U.S. Treasury and other government |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 13,854 | 10,197 |
U.S. Plans | State and Municipal Debt Obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 386 | 605 |
U.S. Plans | Foreign Covered Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 1,031 | 1,748 |
U.S. Plans | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 20,075 | 26,081 |
U.S. Plans | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 26,204 | 17,413 |
U.S. Plans | Mid Cap Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 13,392 | 11,748 |
U.S. Plans | Small Cap Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 15,720 | 18,419 |
U.S. Plans | Equity Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 265,969 | 273,893 |
U.S. Plans | Mutal Funds - Multi-class |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 78,143 | 72,802 |
U.S. Plans | Debt Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 22,215 | 20,516 |
U.S. Plans | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 39,704 | 28,371 |
U.S. Plans | Limited Partner |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 172 | 180 |
U.S. Plans | Large Cap Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 1,927 |
U.S. Plans | International Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 3,333 |
Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 187,112 | 188,960 | 179,928
Non-U.S. Plans | Foreign Covered Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 227 | 182 |
Non-U.S. Plans | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 123 | 456 |
Non-U.S. Plans | Pooled Equity Securities Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 78,733 | 88,540 |
Non-U.S. Plans | Pooled Funds Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 79,061 | 70,180 |
Non-U.S. Plans | Insurance Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 27,843 | 28,268 |
Non-U.S. Plans | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 1,125 | 1,334 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 68,816 | 63,798 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Plans | Mid Cap Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 13,392 | 11,748 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Plans | Small Cap Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 15,720 | 18,419 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Plans | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 39,704 | 28,371 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Plans | Large Cap Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 1,927 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Plans | International Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 3,333 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 123 | 456 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S. Plans | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 123 | 456 |
Significant Other Observable Inputs (Level 2) | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 427,877 | 423,255 |
Significant Other Observable Inputs (Level 2) | U.S. Plans | U.S. Treasury and other government |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 13,854 | 10,197 |
Significant Other Observable Inputs (Level 2) | U.S. Plans | State and Municipal Debt Obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 386 | 605 |
Significant Other Observable Inputs (Level 2) | U.S. Plans | Foreign Covered Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 1,031 | 1,748 |
Significant Other Observable Inputs (Level 2) | U.S. Plans | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 20,075 | 26,081 |
Significant Other Observable Inputs (Level 2) | U.S. Plans | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 26,204 | 17,413 |
Significant Other Observable Inputs (Level 2) | U.S. Plans | Equity Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 265,969 | 273,893 |
Significant Other Observable Inputs (Level 2) | U.S. Plans | Mutal Funds - Multi-class |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 78,143 | 72,802 |
Significant Other Observable Inputs (Level 2) | U.S. Plans | Debt Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 22,215 | 20,516 |
Significant Other Observable Inputs (Level 2) | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 159,146 | 160,236 |
Significant Other Observable Inputs (Level 2) | Non-U.S. Plans | Foreign Covered Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 227 | 182 |
Significant Other Observable Inputs (Level 2) | Non-U.S. Plans | Pooled Equity Securities Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 78,733 | 88,540 |
Significant Other Observable Inputs (Level 2) | Non-U.S. Plans | Pooled Funds Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 79,061 | 70,180 |
Significant Other Observable Inputs (Level 2) | Non-U.S. Plans | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 1,125 | 1,334 |
Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 28,015 | 28,448 | $ 30,387
Significant Unobservable Inputs (Level 3) | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 172 | 180 |
Significant Unobservable Inputs (Level 3) | U.S. Plans | Limited Partner |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 172 | 180 |
Significant Unobservable Inputs (Level 3) | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 27,843 | 28,268 |
Significant Unobservable Inputs (Level 3) | Non-U.S. Plans | Insurance Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | $ 27,843 | $ 28,268 |

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