Summary of Significant Accounting Policies (Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 3,285	$ 3,934
Additions	1,134	1,475
Uncollectible accounts charged to allowance, net of recoveries	(2,726)	(2,124)
Balance at end of period	$ 1,693	$ 3,285