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EARNINGS PER SHARE - Computation of basic and diluted earnings per share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2012
Numerator:                      
Net income (loss) attributable to common stockholders                 $ 176,937 $ 80,490 $ (9,842)
Denominator:                      
Weighted-average shares used in computing basic net income (loss) per share                 87,772 88,314 83,460
Weighted-average shares used in computing diluted net income (loss) per share                 89,715 90,259 83,460
Net income (loss) per share of common stock:                      
Net income (loss) per basic share of common stock (in dollars per share) $ 0.56 $ 0.51 $ 0.48 $ 0.46 $ 0.33 $ 0.24 $ 0.20 $ 0.14 $ 2.02 $ 0.91 $ (0.12)
Net income (loss) per diluted share of common stock (in dollars per share) $ 0.55 $ 0.50 $ 0.47 $ 0.45 $ 0.32 $ 0.23 $ 0.20 $ 0.14 $ 1.97 $ 0.89 $ (0.12)
Stock options
                      
Denominator:                      
Dilutive potential common shares                 1,696 1,803 0
Restricted stock units
                      
Denominator:                      
Dilutive potential common shares                 247 142 0