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STOCK BASED COMPENSATION - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Feb. 28, 2005
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Authorized shares available for future issuance (in shares)   10,026,282    
Proceeds from exercise of stock options   $ 1,436 $ 1,106 $ 1,686
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Aggregate intrinsic value of options exercised   24,800 4,900 9,200
Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation costs   $ 5,300    
Weighted-average period for recognition   3 years 1 month    
Intrinsic value of RSU's vested   $ 6,200 $ 4,600 $ 6,400
Total intrinsic value of all awards outstanding   $ 9,400    
2010 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Authorized number of shares (in shares)   8,000,000    
2010 Plan | Stock options and RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   4 years    
2005 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award expiration period   10 years    
Additional awards that may be granted (in shares)   0    
Minimum | 2010 Plan | Stock options and RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award expiration period   5 years    
Minimum | 2010 Plan | Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Option price as percentage of fair market value on the date of grant   100.00%    
Maximum | 2010 Plan | Stock options and RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award expiration period   10 years    
First anniversary | 2005 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage 25.00%      
Monthly | 2005 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years