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Employee Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Defined Contribution Plan Disclosure [Line Items]      
Contributions and expenses $ 1,557 $ 1,326 $ 2,542
Tranche 1      
Defined Contribution Plan Disclosure [Line Items]      
Employer percent match 100.00%    
Percentage of employees' gross pay 3.00%    
Tranche 2      
Defined Contribution Plan Disclosure [Line Items]      
Employer percent match 50.00%    
Percentage of employees' gross pay 2.00%