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Supporting Financial Information - Accounts Receivable (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Sep. 30, 2024
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Billed receivables | $ 29,793 | $ 25,904
Contract assets | 21,920 | 23,945
Allowance for doubtful accounts | 0 | 0
Accounts receivable | $ 51,713 | $ 49,849

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