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Employment Agreements and Retirement Plans - Supplemental Executive Retirement Plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Retirement Benefits [Abstract]      
Contributions to the Supplemental Executive Retirement Plan $ 483 $ 536 $ 636
Amortized expense due to Supplemental Executive Retirement Plan $ 476 $ 544 $ 153