EARNINGS PER SHARE - Calculation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Basic earnings per share:
Net income	$ (45,169)	$ 118,333	$ 157,751	$ 448,129
Shares used in computation:
Weighted-average ordinary shares outstanding (in shares)	524,876	528,405	528,528	529,984
Basic earnings per share (in dollars per share)	$ (0.09)	$ 0.22	$ 0.30	$ 0.85
Diluted earnings per share:
Net income	$ (45,169)	$ 118,333	$ 157,751	$ 448,129
Shares used in computation:
Weighted-average ordinary shares outstanding (in shares)	524,876	528,405	528,528	529,984
Weighted-average ordinary share equivalents from stock options and awards (in shares)	0	5,947	3,780	5,988
Weighted-average ordinary shares and ordinary share equivalents outstanding (in shares)	524,876	534,352	532,308	535,972
Diluted earnings per share (in dollars per share)	$ (0.09)	$ 0.22	$ 0.30	$ 0.84