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Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Intangible Assets Net Excluding Goodwill [Abstract]        
Amortization expense recognized $ 0.4 $ 0.5 $ 0.7 $ 0.9
Amortization expense for remainder of 2020 0.7   0.7  
Amortization expense for 2021 1.2   1.2  
Amortization expense for 2022 1.0   1.0  
Amortization expense for 2023 0.9   0.9  
Amortization expense for 2024 $ 0.8   $ 0.8