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Income Taxes - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2017
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
Income Tax Disclosure [Abstract]            
Income tax benefit $ (776,000) $ 1,248,000   $ (2,382,000) $ 3,445,000  
Discrete tax benefit under CARES Act         $ 1,800,000  
U.S. federal statutory tax rate 21.00% 21.00% 35.00% 21.00% 21.00%  
Discrete tax benefits related to stock-based compensation awards $ 100,000 $ 100,000   $ 700,000 $ 300,000  
Unrecognized tax benefits excluding interest and penalties that would impact effective tax rate 3,100,000     3,100,000   $ 2,700,000
Undistributed earnings in foreign subsidiaries $ 0     $ 0   $ 0