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Summary of Quarterly Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	May 31, 2020	Feb. 29, 2020	Nov. 30, 2019	Aug. 31, 2019	May 31, 2019	Feb. 28, 2019	Nov. 30, 2018	Aug. 31, 2018	May 31, 2020	May 31, 2019	May 31, 2018
Total Revenue	$ 109,074	$ 99,869	$ 107,803	$ 101,424	$ 109,762	$ 97,700	$ 107,098	$ 99,626	$ 418,170	$ 414,186	$ 397,930
Gross Margin	51,729	45,330	51,026	48,194	50,530	44,628	50,033	46,729	196,279	191,920	186,272
Net Income	$ 16,347	$ 12,200	$ 16,276	$ 14,652	$ 15,815	$ 13,073	$ 16,051	$ 15,237	$ 59,475	$ 60,176	$ 63,215
Basic net income per share	$ 0.31	$ 0.23	$ 0.31	$ 0.28	$ 0.31	$ 0.25	$ 0.31	$ 0.29	$ 1.13	$ 1.16	$ 1.23
Diluted net income per share	$ 0.31	$ 0.23	$ 0.31	$ 0.28	$ 0.30	$ 0.25	$ 0.31	$ 0.29	$ 1.13	$ 1.15	$ 1.21

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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