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Summary Of Significant Accounting Policies (Allowance for Uncollectible Accounts) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Allowance for Uncollectible Accounts [Roll Forward]    
Balance at Beginning of Period $ 26,194 $ 36,295
Additions Charged to Costs and Expenses 4,605 4,157
Discounts on Purchased Receivables 107 119
Net Accounts Receivable Written-Off (2,522) (3,455)
Balance at End of Period $ 28,384 $ 37,116