Summary Of Significant Accounting Policies (Allowance for Uncollectible Accounts) (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Allowance for Uncollectible Accounts [Roll Forward]
Balance at Beginning of Period	$ 36,295	$ 40,228
Additions Charged to Costs and Expenses	11,774	13,142
Discounts on Purchased Receivables	698	1,316
Net Accounts Receivable Written-Off	(16,145)	(11,578)
Balance at End of Period	$ 32,622	$ 43,108