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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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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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