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Summary Of Significant Accounting Policies (Allowance for Uncollectible Accounts) (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Allowance for Uncollectible Accounts [Roll Forward]    
Balance at Beginning of Period $ 26,194 $ 36,295
Additions Charged to Costs and Expenses 15,497 9,766
Discounts on Purchased Receivables 535 468
Net Accounts Receivable Written-Off (18,775) (6,834)
Balance at End of Period $ 23,451 $ 39,695