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Supporting Financial Information - Accounts Receivable (Details) - USD ($) | Jun. 30, 2021 | Sep. 30, 2020
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Billed receivables | $ 30,325,000 | $ 24,598,000
Contract assets | 6,084,000 | 7,943,000
Total accounts receivable | 36,409,000 | 32,541,000
Less: Allowance for doubtful accounts | 0 | 0
Accounts receivable, net | $ 36,409,000 | $ 32,541,000

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