Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Deferred Tax Assets:
Research and experimental expenditures	$ 18,406	$ 12,552
Long-term contracts	6,801	7,480
Deferred compensation	3,306	2,868
Uniform capitalization and inventory	2,016	1,511
Warranty accrual	1,447	1,304
Stock-based compensation	1,367	1,269
Reserve for accrued employee benefits	1,189	1,029
Net operating loss	1,086	1,248
Credit carryforwards	797	1,304
Other	671	655
Deferred tax assets	37,086	31,220
Deferred Tax Liabilities:
Depreciation and amortization	(5,687)	(3,773)
Retention and other	(1,597)	(1,310)
Deferred tax liabilities	(7,284)	(5,083)
Less: valuation allowance	(1,659)	(1,599)
Net deferred tax asset	$ 28,143	$ 24,538