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Income Taxes - Components of Income Taxes Benefit (Provision) (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Current benefit (provision):          
Federal     $ (209) $ (46) $ (101)
State     (87) (45) 995
Total current benefit (provision)     (296) (91) 894
Deferred benefit (provision):          
Federal     22,056    
State     5,654    
Total deferred benefit (provision)     27,710    
Total income tax benefit (provision) $ 27,414 $ (91) $ 27,414 $ (91) $ 894