Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Total	$ 44,225	$ 83,343	$ 172,383	$ 263,337
Prime Contractor
Disaggregation of Revenue [Line Items]
Total	38,798	76,598	157,524	241,457
Subcontractor
Disaggregation of Revenue [Line Items]
Total	5,427	6,745	14,859	21,880
Time and Materials
Disaggregation of Revenue [Line Items]
Total	7,687	42,438	59,642	138,178
Firm Fixed Price
Disaggregation of Revenue [Line Items]
Total	21,939	22,559	70,184	69,088
Cost Reimbursable
Disaggregation of Revenue [Line Items]
Total	14,599	18,346	42,557	56,071
Department of Health and Human Services \| Revenue from Contract with Customer \| Customer concentration
Disaggregation of Revenue [Line Items]
Total	31,255	43,088	98,381	129,834
Department of Veterans Affairs \| Revenue from Contract with Customer \| Customer concentration
Disaggregation of Revenue [Line Items]
Total	6,290	26,979	52,938	89,774
Department of Defense \| Revenue from Contract with Customer \| Customer concentration
Disaggregation of Revenue [Line Items]
Total	6,610	12,722	20,666	40,788
Other \| Revenue from Contract with Customer \| Customer concentration
Disaggregation of Revenue [Line Items]
Total	$ 70	$ 554	$ 398	$ 2,941