Summary Of Significant Accounting Policies (Allowance of Uncollectible Amounts) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Allowance for Uncollectible Accounts [Roll Forward]
Balance at Beginning of Year	$ 31,639	$ 22,810	$ 25,788
Additions Charged to Costs and Expenses	13,209	14,940	12,339
Add: Discounts on Purchased Receivables	1,314	1,168	1,353
Deduct: Net Accounts Receivable Written-Off	5,934	7,279	16,670
Balance at End of Year	$ 40,228	$ 31,639	$ 22,810