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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Total Revenue	$ 67,233	$ 66,440	$ 108,699	$ 152,801	$ 65,182	$ 61,555	$ 61,506	$ 57,852	$ 395,173	$ 246,094
Prime Contractor
Disaggregation of Revenue [Line Items]
Total Revenue									366,571	215,241
Subcontractor
Disaggregation of Revenue [Line Items]
Total Revenue									28,602	30,853
Time and Materials
Disaggregation of Revenue [Line Items]
Total Revenue									308,944	185,656
Cost Reimbursable
Disaggregation of Revenue [Line Items]
Total Revenue									46,231	48,101
Firm Fixed Price
Disaggregation of Revenue [Line Items]
Total Revenue									39,998	12,337
Department of Homeland Security | Revenue Concentration | Customer Concentration
Disaggregation of Revenue [Line Items]
Total Revenue									126,576	2,485
Department of Veterans Affairs | Revenue Concentration | Customer Concentration
Disaggregation of Revenue [Line Items]
Total Revenue									126,106	110,078
Department of Health and Human Services | Revenue Concentration | Customer Concentration
Disaggregation of Revenue [Line Items]
Total Revenue									102,201	91,543
Department of Defense | Revenue Concentration | Customer Concentration
Disaggregation of Revenue [Line Items]
Total Revenue									33,612	30,930
Other | Revenue Concentration | Customer Concentration
Disaggregation of Revenue [Line Items]
Total Revenue									$ 6,678	$ 11,058

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