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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 395,937 | $ 375,872
Prime Contractor |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 355,147 | 356,792
Subcontractor |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 40,790 | 19,080
Time and Materials |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 215,341 | 209,951
Cost Reimbursable |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 79,481 | 81,797
Firm Fixed Price |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 101,115 | 84,124
Department of Health and Human Services | Revenue Concentration | Customer Concentration |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 184,544 | 161,311
Department of Veterans Affairs | Revenue Concentration | Customer Concentration |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 139,945 | 138,862
Department of Defense | Revenue Concentration | Customer Concentration |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 64,128 | 70,325
Other | Revenue Concentration | Customer Concentration |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 7,320 | $ 5,374

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