Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Tax Disclosure [Line Items]
U.S. federal statutory tax rate			21.00%
Excess tax benefits related to stock based compensation expense		$ 100,000	$ 200,000	$ 900,000
Deferred tax asset valuation allowance	$ 17,672,000	22,005,000	17,672,000
Valuation allowance change	10,200,000
Unrecognized tax benefits excluding interest and penalties that would impact effective tax rate	2,500,000	3,100,000	2,500,000
Accrued interest and penalties on unrecognized tax benefits	300,000	500,000	300,000
Undistributed earnings in foreign subsidiaries	$ 0	$ 0	$ 0