Summary Of Significant Accounting Policies (Allowance for Uncollectible Accounts) (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Allowance for Uncollectible Accounts [Roll Forward]
Balance at Beginning of Period	$ 31,639	$ 22,810
Additions Charged to Costs and Expenses	12,024	13,375
Discounts on Purchased Receivables	1,211	1,097
Net Accounts Receivable Written-Off	(2,891)	(4,960)
Balance at End of Period	$ 41,983	$ 32,322