Summary Of Significant Accounting Policies (Allowance for Uncollectible Accounts) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Allowance for Uncollectible Accounts [Roll Forward]
Balance at Beginning of Period	$ 36,295	$ 40,228
Additions Charged to Costs and Expenses	4,157	5,035
Discounts on Purchased Receivables	119	228
Net Accounts Receivable Written-Off	(3,455)	(1,566)
Balance at End of Period	$ 37,116	$ 43,925