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Schedule of Components of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Current Provision (Benefit) - Federal	$ 86,459	$ 64,256	$ 62,424
Current Provision (Benefit) - State	7,638	4,727	(2,155)
Current Provision (Benefit) - Total	94,097	68,983	60,269
Deferred Provision (Benefit) - Federal	7,274	(546)	(962)
Deferred Provision (Benefit) - State	(5,071)	(1,777)	6,767
Deferred Provision (Benefit) - Total	2,203	(2,323)	5,805
Provision for Income Taxes	$ 96,300	$ 66,660	$ 66,074

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