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STOCK BASED COMPENSATION - Option activity for company's stock incentive plans (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Number of Shares, Beginning Balance 3,614,262 3,347,445 6,171,707  
Number of Shares, Granted   683,500 161,000  
Number of Shares, Exercised (849,635) (266,558) (2,885,470)  
Number of Shares, Forfeitures and Cancellations (107,485) (150,125) (99,792)  
Number of Shares, Ending Balance 2,657,142 3,614,262 3,347,445 6,171,707
Number of Shares, Vested and expected to vest as of June 30, 2013 2,635,599      
Number of Shares, Vested and exercisable as of June 30, 2013 2,233,533      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]        
Options Outstanding, Weighted Average Exercise Price, Beginning Balance, USD per share $ 3.07 $ 1.45 $ 0.72  
Options, Granted, Weighted Average Exercise Price, USD per share   $ 11.29 $ 10.44  
Options, Exercised, Weighted Average Exercise Price, USD per share $ 2.46 $ 2.39 $ 0.28  
Options, Forfeitures and Cancellations, Weighted Average Exercise Price, USD per share $ 10.55 $ 5.68 $ 4.71  
Options Outstanding, Weighted Average Exercise Price, Ending Balance, USD per share $ 2.96 $ 3.07 $ 1.45 $ 0.72
Options, Weighted Average Exercise Price, Vested and expected to vest, Ending Balance, USD per share $ 2.89      
Options, Weighted Average Exercise Price, Vested and exercisable, Ending Balance, USD per share $ 1.60      
Options outstanding, Weighted Average Remaining Contractual Term, Ending Balance 5 years 1 month 10 days 6 years 2 months 1 day 6 years 7 months 13 days 6 years 5 months 9 days
Options, Remaining Contractual Term, Vested and expected to vest, Ending Balance 5 years 1 month 2 days      
Options, Weighted Average Remaining Contractual Term, Vested and exercisable, Ending Balance 4 years 6 months 22 days      
Options outstanding, Intrinsic Value, Ending Balance $ 112,215 $ 52,330 $ 42,920 $ 43,135
Options, Aggregate Intrinsic Value, Vested and expected to vest, Ending Balance 111,482      
Options, Aggregate Intrinsic Value, Vested and exercisable, Ending Balance $ 97,363