Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2017
Income Tax Disclosure [Line Items]
U.S. federal statutory tax rate	21.00%			35.00%
Excess tax benefits related to stock based compensation expense	$ 200,000	$ 900,000	$ 400,000
Deferred tax asset valuation allowance	17,672,000	7,253,000
Valuation allowance change	10,978,000	1,059,000	$ 825,000
Unrecognized tax benefits excluding interest and penalties that would impact effective tax rate	2,500,000	2,700,000
Accrued interest and penalties on unrecognized tax benefits	300,000	400,000
Undistributed earnings in foreign subsidiaries	0	$ 0
U.S Deferred Tax Assets [Member]
Income Tax Disclosure [Line Items]
Valuation allowance change	$ 10,200,000