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Equity - Schedule of Non-Vested Restricted Stock Units Compensation (Detail) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total expected compensation expense related to RSUs $ 894 $ 1,125
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total expected compensation expense related to RSUs 14,975  
Recognized compensation expense related to RSUs (12,037)  
Unrecognized compensation expense for RSUS $ 2,938  
Weighted average remaining years to expense for RSUs 2 years 7 months 6 days