Summary Of Significant Accounting Policies (Allowance for Uncollectible Accounts) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Allowance for Uncollectible Accounts [Roll Forward]
Balance at Beginning of Period	$ 31,639	$ 22,810
Additions Charged to Costs and Expenses	3,742	4,679
Discounts on Purchased Receivables	161	170
Net Accounts Receivable Recovered	57
Net Accounts Receivable Written-Off		(1,438)
Balance at End of Period	$ 35,599	$ 26,221