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Income Taxes - Additional Information (Detail) - USD ($)
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Income Tax Disclosure [Abstract]      
Income tax (expense) benefit $ (168,000) $ 250,000  
U.S. federal statutory tax rate 21.00% 21.00%  
Discrete tax benefits related to stock-based compensation awards $ 100,000 $ 200,000  
Unrecognized tax benefits excluding interest and penalties that would impact effective tax rate 3,100,000   $ 2,700,000
Undistributed earnings in foreign subsidiaries $ 0   $ 0