Stockholders' Equity - Schedule of Treasury Stock Purchases and Issuance (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Shares
Beginning Balance (in shares)	939,632
Purchased (in shares)	7,000
Issued to employees and directors (in shares)	(10,158)
Ending Balance (in shares)	936,474
Cost
Beginning Balance	$ 31,943
Purchased	238	$ 25,576
Issued to employees and directors	(397)
Ending Balance	$ 31,784