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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2018
Oct. 01, 2017
Income Taxes [Line Items]            
Income tax provision $ (1,430) $ 17 $ 2,283 $ 91    
Effective tax rate     (31.00%)      
Income tax provision related to the enactment of the Tax Act     $ 4,400      
ASU 2016-09 | Retained Earnings            
Income Taxes [Line Items]            
Cumulative effect of new accounting principle in period of adoption           $ 8,300
Scenario, Forecast            
Income Taxes [Line Items]            
Blended tax rate         24.30%