Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Total	$ 83,343	$ 100,694	$ 263,337	$ 299,551
Prime Contractor
Disaggregation of Revenue [Line Items]
Total	76,598	90,791	241,457	269,109
Subcontractor
Disaggregation of Revenue [Line Items]
Total	6,745	9,903	21,880	30,442
Time and Materials
Disaggregation of Revenue [Line Items]
Total	42,438	54,978	138,178	165,260
Firm Fixed Price
Disaggregation of Revenue [Line Items]
Total	22,559	26,203	69,088	74,125
Cost Reimbursable
Disaggregation of Revenue [Line Items]
Total	18,346	19,513	56,071	60,166
Department of Health and Human Services | Revenue from Contract with Customer | Customer concentration
Disaggregation of Revenue [Line Items]
Total	43,088	48,301	129,834	139,937
Department of Veterans Affairs | Revenue from Contract with Customer | Customer concentration
Disaggregation of Revenue [Line Items]
Total	26,979	35,492	89,774	105,788
Department of Defense | Revenue from Contract with Customer | Customer concentration
Disaggregation of Revenue [Line Items]
Total	12,722	15,175	40,788	48,458
Other | Revenue from Contract with Customer | Customer concentration
Disaggregation of Revenue [Line Items]
Total	$ 554	$ 1,726	$ 2,941	$ 5,368