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Income Before Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
May 31, 2020 | May 31, 2019 | May 31, 2018
Income Before Income Taxes [Line Items] |  |  |
Income Before Income Taxes | $ 72,305 | $ 72,959 | $ 73,465
U.S. |  |  |
Income Before Income Taxes [Line Items] |  |  |
Income Before Income Taxes | 62,329 | 58,479 | 62,310
Foreign |  |  |
Income Before Income Taxes [Line Items] |  |  |
Income Before Income Taxes | $ 9,976 | $ 14,480 | $ 11,155

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