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EARNINGS PER SHARE - Computation of basic and diluted earnings per share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Numerator:        
Net income and comprehensive income $ 64,432 $ 52,699 $ 196,828 $ 155,910
Denominator:        
Weighted-average shares used in computing basic net income per share (in shares) 81,652 83,349 81,879 85,051
Add—dilutive potential common shares:        
Weighted-average shares used in computing diluted net income per share (in shares) 83,317 84,685 83,694 86,433
Net income per share of common stock:        
Basic (in usd per share) $ 0.79 $ 0.63 $ 2.40 $ 1.83
Diluted (in usd per share) $ 0.77 $ 0.62 $ 2.35 $ 1.80
Stock options(1)        
Add—dilutive potential common shares:        
Dilutive potential common shares (in shares) 1,579 1,264 1,704 1,282
Restricted stock units(1)        
Add—dilutive potential common shares:        
Dilutive potential common shares (in shares) 86 72 111 100
Employee stock option and restricted stock units        
Add—dilutive potential common shares:        
Dilutive potential common shares (in shares) 635   689