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Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Intangible Assets Net Excluding Goodwill [Abstract]        
Amortization expense recognized $ 0.5 $ 0.1 $ 0.9 $ 0.2
Amortization expense for remainder of 2019 0.9   0.9  
Amortization expense for 2020 1.5   1.5  
Amortization expense for 2021 1.2   1.2  
Amortization expense for 2022 1.0   1.0  
Amortization expense for 2023 $ 0.9   $ 0.9