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Supporting Financial Information - Accounts Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Billed receivables $ 32,814 $ 26,140
Contract assets 7,682 7,307
Allowance for doubtful accounts 0 0
Accounts receivable $ 40,496 $ 33,447