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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Deferred Tax Assets: |  |
Research and experimental expenditures | $ 12,552 | $ 8,118
Long-term contracts | 7,480 | 0
Deferred compensation | 2,868 | 2,274
Uniform capitalization and inventory | 1,511 | 1,253
Credit carryforwards | 1,304 | 1,378
Warranty accrual | 1,304 | 752
Stock-based compensation | 1,269 | 1,555
Net operating loss | 1,248 | 7,432
Reserve for accrued employee benefits | 1,029 | 988
Other | 655 | 317
Deferred tax assets | 31,220 | 24,067
Deferred Tax Liabilities: |  |
Depreciation and amortization | (3,773) | (3,545)
Retention and other | (1,310) | (1,491)
Deferred tax liabilities | (5,083) | (5,036)
Less: valuation allowance | (1,599) | (1,967)
Net deferred tax asset | $ 24,538 | $ 17,064

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