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Share-Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Employee Service Share Based Compensation Aggregate Disclosures [Abstract]    
Unrecognized compensation cost related to unvested share-based compensation arrangements $ 11.9  
Unrecognized compensation cost, period for recognition 1 year 7 months 6 days  
Share-based compensation expense $ 1.5 $ 0.5