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Retirement Plans - Supplemental Executive Retirement Plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]      
Contributions to the Supplemental Executive Retirement Plan $ 356 $ 499 $ 1,069
Amortized expense due to Supplemental Executive Retirement Plan $ 405 $ 484 $ 976