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Stock-Based Compensation and Equity Grants - Schedule of Unrecognized Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 9 Months Ended |
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Jun. 30, 2025 | Jun. 30, 2024
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total unrecognized expense | $ 4,158 | $ 6,299
DLH employees |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total unrecognized expense | $ 4,003 | 6,119
Weighted average share based compensation expense recognition period | 2 years 3 months 14 days |
Non-employee directors |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total unrecognized expense | $ 155 | $ 180

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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