Stock-Based Compensation and Equity Grants - Schedule of Unrecognized Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands |
9 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | ||
| Total unrecognized expense | $ 3,622 | $ 4,158 |
| DLH employees | ||
| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | ||
| Total unrecognized expense | $ 3,525 | 4,003 |
| Weighted average share based compensation expense recognition period | 2 years 9 months 18 days | |
| Non-employee directors | ||
| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | ||
| Total unrecognized expense | $ 97 | $ 155 |