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Valuation and Qualifying Accounts and Reserves (Schedule II) (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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May 31, 2020 | May 31, 2019 | May 31, 2018
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Restructuring Expense | $ 33,108 | $ 42,310 | $ 17,514
Environmental Reserves, Noncurrent |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Restructuring Expense |  |  | $ 1,700

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