STOCK-BASED COMPENSATION Stock Option Activity (Details) - Stock Options [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at March 31, 2015	1,558
Options granted	287
Options exercised	(224)
Options forfeited or expired	(36)
Options outstanding at December 31, 2015	1,585
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, 2015	$ 36.59
Weighted average exercise price of options granted	53.55
Weighted average exercise price of options exercised	30.79
Weighted average exercise price of options forfeited or expired	46.66
Weighted average exercise price of options outstanding, December 31, 2015	$ 40.25
Weighted average remaining contractual life of options outstanding at December 31, 2015	4 years
Aggregate intrinsic value of options outstanding at December 31, 2015	$ 14,910
Vested and expected to vest at December 31, 2015	1,544
Weighted average exercise price of options vested and expected to vest at December 31, 2015	$ 39.95
Weighted average remaining contractual life of options vested and expected to vest at December 31, 2015	3 years 329 days
Aggregate intrinsic value of options vested and expected to vest at December 31, 2015	$ 14,881
Exercisable at December 31, 2015	1,091
Weighted average exercise price of options exercisable at December 31, 2015	$ 35.52
Weighted average remaining contractual life of options exercisable at December 31, 2015	3 years 37 days
Aggregate intrinsic value of options exercisable at December 31, 2015	$ 14,279
Total intrinsic value of options exercised	5,600	$ 11,600
Total cash received as a result of stock option exercises, net of taxes	6,900
Total unrecognized compensation cost related to unvested stock options	$ 4,500
Weighted average period of recognition for unrecognized compensation cost related to unvested stock options	2 years 37 days