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Income Taxes - Components of Income Taxes Provision (Benefit) (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Current provision:                
Federal           $ 496 $ 209 $ 46
State           73 87 45
Total current provision           569 296 91
Deferred provision (benefit):                
Federal           11,691 (22,056)  
State           (52) (5,654)  
Total deferred provision (benefit)           11,639 (27,710)  
Total income tax provision (benefit) $ 678 $ 9,285 $ 1,497 $ 748 $ (27,414) $ 12,208 $ (27,414) $ 91