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Pension Plan Assets Categorized Using Fair Value Hierarchy (Detail) - Pension Benefits - USD ($) $ in Thousands | May 31, 2023 | May 31, 2022 | May 31, 2021
--- | --- | --- | ---
U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | $ 631,486 | $ 616,960 | $ 672,377
U.S. Plans | U.S. Treasury and other government |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 49,297 | 34,902 |
U.S. Plans | State and Municipal Debt Obligations |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 450 | 576 |
U.S. Plans | Foreign Covered Bonds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 690 | 1,150 |
U.S. Plans | Mortgage-backed securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 8,515 | 10,254 |
U.S. Plans | Corporate bonds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 17,376 | 23,883 |
U.S. Plans | Large Cap Equity Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 35,467 | 30,295 |
U.S. Plans | Equity Mutual Funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 304,590 | 295,905 |
U.S. Plans | Mutal Funds - Multi-class |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 125,345 | 136,583 |
U.S. Plans | Debt Mutual Funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 2,553 | 16,368 |
U.S. Plans | Cash and Cash Equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 36,573 | 37,004 |
U.S. Plans | Limited Partner |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 170 | 166 |
U.S. Plans | Futures contracts |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 112 |  |
U.S. Plans | Investments Measured at NAV |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets | [1] | 50,348 | 29,874 |
Non-U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 166,120 | 193,375 | 239,853
Non-U.S. Plans | Foreign Covered Bonds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 774 | 920 |
Non-U.S. Plans | Cash and Cash Equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 146 | 109 |
Non-U.S. Plans | Pooled Equity Securities Funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 61,827 | 68,067 |
Non-U.S. Plans | Pooled Funds Fixed Income Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 80,650 | 100,151 |
Non-U.S. Plans | Insurance Contracts |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 19,136 | 23,013 |
Non-U.S. Plans | Mutual funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 3,587 | 1,115 |
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 |  | 72,040 | 67,299 |
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 |  | 35,467 | 30,295 |
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 |  | 36,573 | 37,004 |
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 |  | 146 | 109 |
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 |  | 146 | 109 |
Significant Other Observable Inputs (Level 2) | U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 508,816 | 519,621 |
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 |  | 49,297 | 34,902 |
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 |  | 450 | 576 |
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 |  | 690 | 1,150 |
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 |  | 8,515 | 10,254 |
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 |  | 17,376 | 23,883 |
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 |  | 304,590 | 295,905 |
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 |  | 125,345 | 136,583 |
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 |  | 2,553 | 16,368 |
Significant Other Observable Inputs (Level 2) | Non-U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 146,838 | 170,253 |
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 |  | 774 | 920 |
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 |  | 61,827 | 68,067 |
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 |  | 80,650 | 100,151 |
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 |  | 3,587 | 1,115 |
Significant Unobservable Inputs (Level 3) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 19,418 | 23,179 | $ 28,398
Significant Unobservable Inputs (Level 3) | U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 282 | 166 |
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 | 166 |
Significant Unobservable Inputs (Level 3) | U.S. Plans | Futures contracts |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 112 |  |
Significant Unobservable Inputs (Level 3) | Non-U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension plans with Plan Assets |  | 19,136 | 23,013 |
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 |  | $ 19,136 | $ 23,013 |
[1] | In accordance with Subtopic 820-10, Fair Value Measurements and Disclosures, certain investments that are measured at fair value using the net asset value ("NAV") per share practical expedient have not been classified in the fair value hierarchy. The investments that are measured at fair value using NAV per share included in the table above are intended to permit reconciliation of the fair value hierarchy to the fair value of the plan assets at the end of each period.

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