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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | $ 33,756 | $ 34,401 | $ 67,508 | $ 64,616
Prime |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | 33,538 |  | 67,066 |
Subcontractor |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | 218 |  | 442 |
Time and materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | 32,625 |  | 65,415 |
Cost plus fixed fee |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | 637 |  | 1,246 |
Firm fixed price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | 494 |  | 847 |
Department of Veterans Affairs |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | 23,197 |  | 46,008 |
Department of Health and Human Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | 9,706 |  | 19,973 |
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | $ 853 |  | $ 1,527 |

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