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Income Before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019
Income Before Income Taxes [Line Items]
Income Before Income Taxes	$ 75,268	$ 72,305	$ 72,959
U.S.
Income Before Income Taxes [Line Items]
Income Before Income Taxes	55,753	62,329	58,479
Foreign
Income Before Income Taxes [Line Items]
Income Before Income Taxes	$ 19,515	$ 9,976	$ 14,480

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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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