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Employment Agreements and Retirement Plans - Supplemental Executive Retirement Plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Retirement Benefits [Abstract]      
Contributions to the Supplemental Executive Retirement Plan $ 509 $ 483 $ 536
Amortized expense due to Supplemental Executive Retirement Plan $ 474 $ 476 $ 544