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Stock-Based Compensation and Equity Grants - Schedule of Unrecognized Stock-Based Compensation Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total unrecognized expense $ 4,073 $ 5,841
Weighted average share based compensation expense recognition period 2 years 10 months 2 days  
DLH employees    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total unrecognized expense $ 3,783 5,302
Non-employee directors    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total unrecognized expense $ 290 $ 539