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Summary of Significant Accounting Policies (Allowance for Credit Losses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period $ 1,693 $ 3,285
Additions 2,090 1,134
Uncollectible accounts charged to allowance, net of recoveries (2,221) (2,726)
Balance at end of period $ 1,562 $ 1,693