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Net Income Per Share - Additional Information (Detail) - shares
3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Share-Based Awards [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Common shares that were not included in computation of diluted net income per share 3,334,776 1,900,374 3,020,056 1,586,410