EARNINGS PER SHARE - Calculation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Basic earnings per share:
Net income	$ 118,333	$ 129,469	$ 448,129	$ 232,690
Shares used in computation:
Weighted-average ordinary shares outstanding (in shares)	528,405	539,638	529,984	542,780
Basic earnings per share (in dollars per share)	$ 0.22	$ 0.24	$ 0.85	$ 0.43
Diluted earnings per share:
Net income	$ 118,333	$ 129,469	$ 448,129	$ 232,690
Shares used in computation:
Weighted-average ordinary shares outstanding (in shares)	528,405	539,638	529,984	542,780
Weighted-average ordinary share equivalents from stock options and awards (in shares)	5,947	5,384	5,988	5,592
Weighted-average ordinary shares and ordinary share equivalents outstanding (in shares)	534,352	545,022	535,972	548,372
Diluted earnings per share (in dollars per share)	$ 0.22	$ 0.24	$ 0.84	$ 0.42