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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Total | $ 101,007 | $ 99,417 | $ 198,857 | $ 172,155
Prime Contractor |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 90,696 | 93,826 | 178,318 | 161,807
Subcontractor |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 10,311 | 5,591 | 20,539 | 10,348
Time and Materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 55,487 | 53,803 | 110,276 | 102,794
Cost Reimbursable |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 21,326 | 17,260 | 41,077 | 29,840
Firm Fixed Price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 24,194 | 28,354 | 47,504 | 39,521
Department of Health and Human Services | Revenue from Contract with Customer | Customer concentration |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 47,349 | 38,204 | 91,636 | 65,509
Department of Veterans Affairs | Revenue from Contract with Customer | Customer concentration |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 35,616 | 34,883 | 70,296 | 68,591
Department of Defense | Revenue from Contract with Customer | Customer concentration |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 16,412 | 18,972 | 33,283 | 29,235
Other | Revenue from Contract with Customer | Customer concentration |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | $ 1,630 | $ 7,358 | $ 3,642 | $ 8,820

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