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Income Taxes - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2017
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2019
Income Tax Disclosure [Abstract]            
Income tax benefit $ (1,248,000) $ (260,000)   $ (3,445,000) $ (598,000)  
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   $ 300,000 $ 500,000  
Unrecognized tax benefits excluding interest and penalties that would impact effective tax rate 2,800,000     2,800,000   $ 2,100,000
Undistributed earnings in foreign subsidiaries $ 0     $ 0   $ 0