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Supporting Financial Information - Accounts Receivable (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Sep. 30, 2019
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Billed receivables | $ 19,419 | $ 18,924
Contract assets | 10,216 | 4,302
Total accounts receivable | 29,635 | 23,226
Less: Allowance for doubtful accounts | 0 | 0
Accounts receivable, net | $ 29,635 | $ 23,226

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