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Income Taxes - Provision for Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Current:      
Federal $ 19,332 $ 250 $ 0
State 4,445 35 1
Foreign 0 0 279
Deferred:      
Federal 699 4,051 0
State 97 512 0
Foreign 0 0 0
Total $ 24,573 $ 4,848 $ 280