EARNINGS PER SHARE - Calculation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Basic earnings per share:
Net income	$ 129,469	$ 148,910	$ 232,690	$ 382,737
Shares used in computation:
Weighted-average ordinary shares outstanding (in shares)	539,638	554,919	542,780	561,070
Basic earnings per share (in dollars per share)	$ 0.24	$ 0.27	$ 0.43	$ 0.68
Diluted earnings per share:
Net income	$ 129,469	$ 148,910	$ 232,690	$ 382,737
Shares used in computation:
Weighted-average ordinary shares outstanding (in shares)	539,638	554,919	542,780	561,070
Weighted-average ordinary share equivalents from stock options and awards (in shares)	5,384	6,077	5,592	7,856
Weighted-average ordinary shares and ordinary share equivalents outstanding (in shares)	545,022	560,996	548,372	568,926
Diluted earnings per share (in dollars per share)	$ 0.24	$ 0.27	$ 0.42	$ 0.67