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Supporting Financial Information - Accounts Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Billed receivables $ 36,343 $ 38,577
Contract assets 19,234 20,542
Less: Allowance for doubtful accounts 0 0
Accounts Receivable, before Allowance for Credit Loss, Current $ 55,577 $ 59,119