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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | $ 38,700 | $ 36,131 | $ 106,208 | $ 100,747
Prime |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | 36,882 |  | 103,947 |
Subcontractor |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | 1,818 |  | 2,261 |
Time and materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | 33,426 |  | 98,841 |
Cost reimbursable |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | 4,545 |  | 5,791 |
Firm fixed price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | 729 |  | 1,576 |
Department of Veterans Affairs |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | 23,056 |  | 68,563 |
Department of Health and Human Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | 14,297 |  | 34,987 |
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | $ 1,347 |  | $ 2,658 |

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