Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Total	$ 90,782	$ 97,850
Prime Contractor
Disaggregation of Revenue [Line Items]
Total	84,439	87,633
Subcontractor
Disaggregation of Revenue [Line Items]
Total	6,343	10,217
Time and Materials
Disaggregation of Revenue [Line Items]
Total	49,400	54,789
Cost Reimbursable
Disaggregation of Revenue [Line Items]
Total	18,143	19,751
Firm Fixed Price
Disaggregation of Revenue [Line Items]
Total	23,239	23,310
Department of Health and Human Services | Revenue from Contract with Customer | Customer concentration
Disaggregation of Revenue [Line Items]
Total	41,948	44,297
Department of Veterans Affairs | Revenue from Contract with Customer | Customer concentration
Disaggregation of Revenue [Line Items]
Total	34,099	34,680
Department of Defense | Revenue from Contract with Customer | Customer concentration
Disaggregation of Revenue [Line Items]
Total	13,355	16,871
Other | Revenue from Contract with Customer | Customer concentration
Disaggregation of Revenue [Line Items]
Total	$ 1,380	$ 2,002