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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Total Revenue	$ 66,440	$ 61,555	$ 327,940	$ 180,913
Revenue from Contract with Customer | Customer concentration
Disaggregation of Revenue [Line Items]
Total Revenue			327,940	180,913
Prime Contractor
Disaggregation of Revenue [Line Items]
Total Revenue	58,743	53,407	304,862	159,059
Subcontractor
Disaggregation of Revenue [Line Items]
Total Revenue	7,697	8,148	23,078	21,854
Time and Materials
Disaggregation of Revenue [Line Items]
Total Revenue	44,672	46,790	263,072	137,492
Cost Reimbursable
Disaggregation of Revenue [Line Items]
Total Revenue	11,979	12,070	34,364	35,796
Firm Fixed Price
Disaggregation of Revenue [Line Items]
Total Revenue	9,789	2,695	30,504	7,625
Department of Homeland Security
Disaggregation of Revenue [Line Items]
Total Revenue	(4,908)	184
Department of Homeland Security | Revenue from Contract with Customer | Customer concentration
Disaggregation of Revenue [Line Items]
Total Revenue			126,397	523
Department of Veterans Affairs
Disaggregation of Revenue [Line Items]
Total Revenue	33,344	27,496
Department of Veterans Affairs | Revenue from Contract with Customer | Customer concentration
Disaggregation of Revenue [Line Items]
Total Revenue			92,270	83,010
Department of Health and Human Services
Disaggregation of Revenue [Line Items]
Total Revenue	27,741	23,245
Department of Health and Human Services | Revenue from Contract with Customer | Customer concentration
Disaggregation of Revenue [Line Items]
Total Revenue			78,452	66,748
Department of Defense
Disaggregation of Revenue [Line Items]
Total Revenue	8,272	7,601
Department of Defense | Revenue from Contract with Customer | Customer concentration
Disaggregation of Revenue [Line Items]
Total Revenue			25,227	22,103
Other
Disaggregation of Revenue [Line Items]
Total Revenue	$ 1,991	$ 3,029
Other | Revenue from Contract with Customer | Customer concentration
Disaggregation of Revenue [Line Items]
Total Revenue			$ 5,594	$ 8,529

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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