STOCK-BASED COMPENSATION Stock Option Activity (Details) (Stock Options [Member], USD $) Share data in Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at March 31, 2013	2,415
Options granted	297
Options exercised	(702)
Options forfeited or expired	(13)
Options outstanding at December 31, 2013	1,997
Weighted average exercise price of options outstanding, March 31, 2013	$ 27.96
Weighted average exercise price of options granted	$ 44.75
Weighted average exercise price of options exercised	$ 24.27
Weighted average exercise price of options forfeited or expired	$ 33.28
Weighted average exercise price of options outstanding, December 31, 2013	$ 31.71
Weighted average remaining contractual life of options outstanding at December 31, 2013	4 years 73 days
Aggregate intrinsic value of options outstanding at December 31, 2013	$ 29,100,000
Vested and expected to vest at December 31, 2013	1,952
Weighted average exercise price of options vested and expected to vest at December 31, 2013	$ 31.52
Weighted average remaining contractual life of options vested and expected to vest at December 31, 2013	4 years 37 days
Aggregate intrinsic value of options vested and expected to vest at December 31, 2013	28,834,000
Exercisable at December 31, 2013	1,364
Weighted average exercise price of options exercisable at December 31, 2013	$ 28.40
Weighted average remaining contractual life of options exercisable at December 31, 2013	3 years 146 days
Aggregate intrinsic value of options exercisable at December 31, 2013	24,373,000
Total intrinsic value of options exercised	15,100,000	5,100,000
Total cash received as a result of stock option exercises, net of taxes	17,000,000
Total unrecognized compensation cost related to unvested stock options	$ 5,800,000
Weighted average period of recognition for unrecognized compensation cost related to unvested stock options	2 years 0 days