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Schedule of Components of Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Income Tax Disclosure [Abstract]      
Current Provision (Benefit) - Federal $ 32,710 $ 58,695 $ 86,459
Current Provision (Benefit) - State 6,536 5,989 7,638
Current Provision (Benefit) - Total 39,246 64,684 94,097
Deferred Provision (Benefit) - Federal (21,039) (52,333) 7,274
Deferred Provision (Benefit) - State (7,332) 2,979 (5,071)
Deferred Provision (Benefit) - Total (28,371) (49,354) 2,203
Provision for Income Taxes $ 10,875 $ 15,330 $ 96,300