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Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Finite-Lived Intangible Assets [Line Items]        
Amortization expense recognized $ 0.1 $ 0.1 $ 0.3 $ 0.3
Amortization expense for remainder of 2018 0.1   0.1  
Amortization expense for 2019 1.8   1.8  
Amortization expense for 2020 1.5   1.5  
Amortization expense for 2021 1.2   1.2  
Amortization expense for 2022 $ 1.0   $ 1.0