Summary of Significant Accounting Policies (Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 3,934	$ 3,778
Additions	1,475	2,803
Uncollectible accounts charged to allowance, net of recoveries	(2,124)	(2,647)
Balance at end of period	$ 3,285	$ 3,934