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Pension Plan Assets Categorized Using Fair Value Hierarchy (Detail) - Pension Benefits - USD ($) $ in Thousands | May 31, 2020 | May 31, 2019 | May 31, 2018
--- | --- | --- | ---
U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | $ 516,550 | $ 496,865 | $ 487,233
U.S. Plans | U.S. Treasury and other government |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 12,973 | 13,854 |
U.S. Plans | State and Municipal Debt Obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 508 | 386 |
U.S. Plans | Foreign Covered Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 715 | 1,031 |
U.S. Plans | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 23,824 | 20,075 |
U.S. Plans | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 34,317 | 26,204 |
U.S. Plans | Mid Cap Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 13,392 |
U.S. Plans | Large Cap Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 19,589 |  |
U.S. Plans | Small Cap Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 15,720 |
U.S. Plans | Equity Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 241,426 | 265,969 |
U.S. Plans | Mutal Funds - Multi-class |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 118,205 | 78,143 |
U.S. Plans | Debt Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 33,993 | 22,215 |
U.S. Plans | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 30,830 | 39,704 |
U.S. Plans | Limited Partner |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 170 | 172 |
Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 194,874 | 187,112 | 188,960
Non-U.S. Plans | Foreign Covered Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 603 | 227 |
Non-U.S. Plans | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 67 | 123 |
Non-U.S. Plans | Pooled Equity Securities Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 78,472 | 78,733 |
Non-U.S. Plans | Pooled Funds Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 87,610 | 79,061 |
Non-U.S. Plans | Insurance Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 27,267 | 27,843 |
Non-U.S. Plans | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 855 | 1,125 |
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 | 50,419 | 68,816 |
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 |
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 | 19,589 |  |
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 |
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 | 30,830 | 39,704 |
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 | 67 | 123 |
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 | 67 | 123 |
Significant Other Observable Inputs (Level 2) | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 465,961 | 427,877 |
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 | 12,973 | 13,854 |
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 | 508 | 386 |
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 | 715 | 1,031 |
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 | 23,824 | 20,075 |
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 | 34,317 | 26,204 |
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 | 241,426 | 265,969 |
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 | 118,205 | 78,143 |
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 | 33,993 | 22,215 |
Significant Other Observable Inputs (Level 2) | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 167,540 | 159,146 |
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 | 603 | 227 |
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 | 78,472 | 78,733 |
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 | 87,610 | 79,061 |
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 | 855 | 1,125 |
Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 27,437 | 28,015 | $ 28,448
Significant Unobservable Inputs (Level 3) | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 170 | 172 |
Significant Unobservable Inputs (Level 3) | U.S. Plans | Limited Partner |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 170 | 172 |
Significant Unobservable Inputs (Level 3) | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | 27,267 | 27,843 |
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 | $ 27,267 | $ 27,843 |

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