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Schedule of Components of Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Income Tax Disclosure [Abstract]      
Current Provision (Benefit) - Federal $ 64,256 $ 62,424 $ 49,604
Current Provision (Benefit) - State 4,727 (2,155) 2,211
Current Provision (Benefit) - Total 68,983 60,269 51,815
Deferred Provision (Benefit) - Federal (546) (962) 7,691
Deferred Provision (Benefit) - State (1,777) 6,767 (1,945)
Deferred Provision (Benefit) - Total (2,323) 5,805 5,746
Provision for Income Taxes $ 66,660 $ 66,074 $ 57,561