Summary of Significant Accounting Policies (Schedule of Allowance for Uncollectible Accounts) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Allowance for Uncollectible Accounts [Roll Forward]
Balance at Beginning of Period	$ 17,099	$ 26,194
Additions Charged to Costs and Expenses	5,214	4,605
Discounts on Purchased Receivables	121	107
Net Accounts Receivable Written-Off	(4,930)	(2,522)
Balance at End of Period	$ 17,504	$ 28,384