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Business Overview - Revenues by Customer (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Concentration Risk [Line Items]
Revenue	$ 66,440	$ 61,555	$ 327,940	$ 180,913
Department of Homeland Security
Concentration Risk [Line Items]
Revenue	(4,908)	184
Department of Veterans Affairs
Concentration Risk [Line Items]
Revenue	33,344	27,496
Department of Health and Human Services
Concentration Risk [Line Items]
Revenue	27,741	23,245
Department of Defense
Concentration Risk [Line Items]
Revenue	8,272	7,601
Other customers with less than 10% share of total revenue
Concentration Risk [Line Items]
Revenue	$ 1,991	$ 3,029
Revenue from Contract with Customer | Customer concentration
Concentration Risk [Line Items]
Revenue			$ 327,940	$ 180,913
Percent of total revenue			100.00%	100.00%
Revenue from Contract with Customer | Customer concentration | Department of Homeland Security
Concentration Risk [Line Items]
Revenue			$ 126,397	$ 523
Percent of total revenue			38.60%	0.30%
Revenue from Contract with Customer | Customer concentration | Department of Veterans Affairs
Concentration Risk [Line Items]
Revenue			$ 92,270	$ 83,010
Percent of total revenue			28.10%	45.90%
Revenue from Contract with Customer | Customer concentration | Department of Health and Human Services
Concentration Risk [Line Items]
Revenue			$ 78,452	$ 66,748
Percent of total revenue			23.90%	36.90%
Revenue from Contract with Customer | Customer concentration | Department of Defense
Concentration Risk [Line Items]
Revenue			$ 25,227	$ 22,103
Percent of total revenue			7.70%	12.20%
Revenue from Contract with Customer | Customer concentration | Other customers with less than 10% share of total revenue
Concentration Risk [Line Items]
Revenue			$ 5,594	$ 8,529
Percent of total revenue			1.70%	4.70%

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