Summary Of Significant Accounting Policies (Allowance for Uncollectible Accounts) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Allowance for Uncollectible Accounts [Roll Forward]
Balance at Beginning of Period	$ 40,228	$ 31,639
Additions Charged to Costs and Expenses	5,035	3,742
Discounts on Purchased Receivables	228	161
Net Accounts Receivable Written-Off	(1,566)
Net Accounts Receivable Recovered		57
Balance at End of Period	$ 43,925	$ 35,599