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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, 2021
Dec. 31, 2020
Sep. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Mar. 31, 2021
Mar. 31, 2020
Numerator:                
Net Income $ 146,075 $ 159,668 $ 156,509 $ 103,722 $ 85,811 $ 98,146 $ 462,252 $ 287,679
Denominator:                
Weighted-average shares used in computing basic net income per share (in shares) 62,810     64,630     63,084 66,003
Add—dilutive potential common shares:                
Weighted-average shares used in computing diluted net income per share (in shares) 62,865     64,699     63,148 66,094
Net income per share of common stock:                
Basic (in usd per share) $ 2.33     $ 1.60     $ 7.33 $ 4.36
Diluted (in usd per share) $ 2.32     $ 1.60     $ 7.32 $ 4.35
Stock options                
Add—dilutive potential common shares:                
Dilutive potential common shares (in shares) 15     24     18 33
Restricted stock units                
Add—dilutive potential common shares:                
Dilutive potential common shares (in shares) 40     45     46 58