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Stock Based Compensation - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 317 $ 194 $ 93  
2005 Stock Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized for issuance under stock incentive plan 15,252,000      
Exercise price of stock option, percentage 100.00%      
Shares available for future grant 1,614,000      
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of share options granted 0 0 0 0
Intrinsic value of the options exercised $ 1,780 $ 3,762 $ 1,976  
Unrecognized compensation cost related to non-vested options granted $ 0   0  
Stock Options | 2005 Stock Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Term of awards 7 years      
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation, period of recognition 2 years 3 months 1 year 6 months    
Restricted stock granted 521,000 718,000    
Total fair value of restricted stock awards vested $ 38,344 $ 19,402 $ 12,185  
Unrecognized compensation cost related to non-vested restricted stock $ 24,740 $ 12,160    
1997 Employee Stock Purchase Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized for issuance under stock incentive plan 1,800,000      
Shares available for future grant 220,000      
Purchase price as a percentage of the lesser of the market value of such shares at either the beginning or the end of each nine-month offering period 85.00%      
Percentage of employee compensation that may be uses to purchase common stock through payroll deductions, maximum 10.00%      
Number of share options granted 82,000 96,000 88,000