UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
NET EARNINGS	$ 19,846	$ 20,098	$ 37,206	$ 36,286
OTHER COMPREHENSIVE INCOME, NET OF TAX:
Foreign currency translation adjustments	520	(350)	557	(613)
Other comprehensive income (loss)	520	(350)	557	(613)
TOTAL COMPREHENSIVE INCOME	$ 20,366	$ 19,748	$ 37,763	$ 35,673