Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Total	$ 89,212	$ 101,007	$ 179,994	$ 198,857
Prime Contractor
Disaggregation of Revenue [Line Items]
Total	81,755	90,696	164,859	178,318
Subcontractor
Disaggregation of Revenue [Line Items]
Total	7,457	10,311	15,135	20,539
Time and Materials
Disaggregation of Revenue [Line Items]
Total	46,339	55,487	95,741	110,276
Cost Reimbursable
Disaggregation of Revenue [Line Items]
Total	19,582	21,326	37,724	41,077
Firm Fixed Price
Disaggregation of Revenue [Line Items]
Total	23,291	24,194	46,529	47,504
Department of Health and Human Services | Revenue from Contract with Customer | Customer concentration
Disaggregation of Revenue [Line Items]
Total	44,590	47,349	86,745	91,636
Department of Veterans Affairs | Revenue from Contract with Customer | Customer concentration
Disaggregation of Revenue [Line Items]
Total	28,696	35,616	62,795	70,296
Department of Defense | Revenue from Contract with Customer | Customer concentration
Disaggregation of Revenue [Line Items]
Total	14,711	16,412	28,066	33,283
Other | Revenue from Contract with Customer | Customer concentration
Disaggregation of Revenue [Line Items]
Total	$ 1,215	$ 1,630	$ 2,388	$ 3,642