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Supporting Financial Information - Accounts Receivable (Details) - USD ($) | Dec. 31, 2021 | Sep. 30, 2021
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Billed receivables | $ 38,168,000 | $ 26,140,000
Contract assets | 8,675,000 | 7,307,000
Total accounts receivable | 46,843,000 | 33,447,000
Less: Allowance for doubtful accounts | 0 | 0
Accounts receivable, net | $ 46,843,000 | $ 33,447,000

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