Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Total	$ 72,738	$ 152,801
Prime Contractor
Disaggregation of Revenue [Line Items]
Total	67,981	146,107
Subcontractor
Disaggregation of Revenue [Line Items]
Total	4,757	6,694
Time and Materials
Disaggregation of Revenue [Line Items]
Total	48,991	132,540
Cost Reimbursable
Disaggregation of Revenue [Line Items]
Total	12,580	10,110
Firm Fixed Price
Disaggregation of Revenue [Line Items]
Total	11,167	10,151
Department Of Homeland Security [Member]
Disaggregation of Revenue [Line Items]
Total	167	91,328
Department of Veterans Affairs
Disaggregation of Revenue [Line Items]
Total	33,708	28,193
Department of Health and Human Services
Disaggregation of Revenue [Line Items]
Total	27,305	23,126
Department of Defense
Disaggregation of Revenue [Line Items]
Total	10,263	8,495
Other
Disaggregation of Revenue [Line Items]
Total	$ 1,295	$ 1,659