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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |
Total | $ 97,850 | $ 72,738
Prime Contractor |  |
Disaggregation of Revenue [Line Items] |  |
Total | 87,633 | 67,981
Subcontractor |  |
Disaggregation of Revenue [Line Items] |  |
Total | 10,217 | 4,757
Time and Materials |  |
Disaggregation of Revenue [Line Items] |  |
Total | 54,789 | 48,991
Cost Reimbursable |  |
Disaggregation of Revenue [Line Items] |  |
Total | 19,751 | 12,580
Firm Fixed Price |  |
Disaggregation of Revenue [Line Items] |  |
Total | 23,310 | 11,167
Department of Health and Human Services | Revenue from Contract with Customer | Customer concentration |  |
Disaggregation of Revenue [Line Items] |  |
Total | 44,297 | 27,305
Department of Veterans Affairs | Revenue from Contract with Customer | Customer concentration |  |
Disaggregation of Revenue [Line Items] |  |
Total | 34,680 | 33,708
Department of Defense | Revenue from Contract with Customer | Customer concentration |  |
Disaggregation of Revenue [Line Items] |  |
Total | 16,871 | 10,263
Other | Revenue from Contract with Customer | Customer concentration |  |
Disaggregation of Revenue [Line Items] |  |
Total | $ 2,002 | $ 1,462

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