Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Total Revenue	$ 54,798	$ 33,756	$ 107,036	$ 67,508
Prime contractor
Disaggregation of Revenue [Line Items]
Total Revenue	50,920	33,538	99,815	67,066
Subcontractor
Disaggregation of Revenue [Line Items]
Total Revenue	3,878	218	7,221	442
Time and materials
Disaggregation of Revenue [Line Items]
Total Revenue	38,162	32,625	74,603	65,415
Cost reimbursable
Disaggregation of Revenue [Line Items]
Total Revenue	15,430	637	30,046	1,246
Firm fixed price
Disaggregation of Revenue [Line Items]
Total Revenue	1,206	494	2,387	847
Department of Veterans Affairs
Disaggregation of Revenue [Line Items]
Total Revenue	25,556	22,696	49,619	45,506
Department of Health and Human Services
Disaggregation of Revenue [Line Items]
Total Revenue	25,861	10,424	49,951	20,691
Other
Disaggregation of Revenue [Line Items]
Total Revenue	$ 3,381	$ 636	$ 7,466	$ 1,311