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, 2014	Dec. 31, 2013
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at March 31, 2014	1,934
Options granted	298
Options exercised	(544)
Options forfeited or expired	(40)
Options outstanding at December 31, 2014	1,648
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted average exercise price of options outstanding, March 31, 2014	$ 31.91
Weighted average exercise price of options granted	$ 47.11
Weighted average exercise price of options exercised	$ 27.49
Weighted average exercise price of options forfeited or expired	$ 39.83
Weighted average exercise price of options outstanding, December 31, 2014	$ 35.92
Weighted average remaining contractual life of options outstanding at December 31, 2014	4 years 73 days
Aggregate intrinsic value of options outstanding at December 31, 2014	$ 29,375,000
Vested and expected to vest at December 31, 2014	1,610
Weighted average exercise price of options vested and expected to vest at December 31, 2014	$ 35.68
Weighted average remaining contractual life of options vested and expected to vest at December 31, 2014	4 years 37 days
Aggregate intrinsic value of options vested and expected to vest at December 31, 2014	29,097,000
Exercisable at December 31, 2014	1,117
Weighted average exercise price of options exercisable at December 31, 2014	$ 31.97
Weighted average remaining contractual life of options exercisable at December 31, 2014	3 years 110 days
Aggregate intrinsic value of options exercisable at December 31, 2014	24,315,000
Total intrinsic value of options exercised	11,600,000	15,100,000
Total cash received as a result of stock option exercises, net of taxes	14,900,000
Total unrecognized compensation cost related to unvested stock options	$ 4,700,000
Weighted average period of recognition for unrecognized compensation cost related to unvested stock options	2 years 0 days