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EARNINGS PER SHARE - Computation of basic and diluted earnings per share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Numerator:                      
Net income and comprehensive income $ 60,678 $ 64,432 $ 60,608 $ 71,788 $ 57,706 $ 52,699 $ 49,452 $ 53,759 $ 257,506 $ 213,616 $ 129,663
Denominator:                      
Weighted-average shares used in computing basic net income per share                 81,478 84,402 88,008
Weighted-average shares used in computing diluted net income per share                 83,252 85,784 89,569
Net income per share of common stock:                      
Net income per basic share of common stock (in dollars per share) $ 0.76 $ 0.79 $ 0.74 $ 0.88 $ 0.70 $ 0.63 $ 0.58 $ 0.62 $ 3.16 $ 2.53 $ 1.47
Net income per diluted share of common stock (in dollars per share) $ 0.74 $ 0.77 $ 0.72 $ 0.86 $ 0.69 $ 0.62 $ 0.57 $ 0.61 $ 3.09 $ 2.49 $ 1.45
Stock options                      
Denominator:                      
Dilutive potential common shares (in shares)                 1,670 1,275 1,392
Restricted stock units                      
Denominator:                      
Dilutive potential common shares (in shares)                 104 107 169