Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
IncomeTaxes [Line Items]
Total incomes taxes paid	$ 4,076,000	$ 7,860,000
Unrecognized tax benefits	1,983,000	1,376,000	$ 176,000
Additional accruals of interest expense nor penalties	$ 0	$ 0
Effective income tax rate	22.50%	29.80%
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 607,000	$ 1,200,000
Federal [Member]
IncomeTaxes [Line Items]
R&D tax credits carryforwards	0	0
R&D Credits	$ 354,000	$ 0