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, 2011 years	Dec. 31, 2010
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at March 31, 2011	5,360
Weighted average exercise price of options outstanding, March 31, 2011	$ 25.58
Options granted	613
Weighted average exercise price of options granted	$ 34.75
Options exercised	(1,301)
Weighted average exercise price of options exercised	$ 20.82
Options forfeited or expired	(796)
Weighted average exercise price of options forfeited or expired	$ 39.03
Options outstanding at December 31, 2011	3,876
Weighted average exercise price of options outstanding, December 31, 2011	$ 25.86
Weighted average remaining contractual life of options outstanding at December 31, 2011	3.6
Aggregate intrinsic value of options outstanding at December 31, 2011	$ 38,710,000
Vested and expected to vest at December 31, 2011	3,780
Weighted average exercise price of options vested and expected to vest at December 31, 2011	$ 25.68
Weighted average remaining contractual life of options vested and expected to vest at December 31, 2011	3.6
Aggregate intrinsic value of options vested and expected to vest at December 31, 2011	38,443,000
Exercisable at December 31, 2011	2,775
Weighted average exercise price of options exercisable at December 31, 2011	$ 23.60
Weighted average remaining contractual life of options exercisable at December 31, 2011	2.7
Aggregate intrinsic value of options exercisable at December 31, 2011	33,850,000
Total intrinsic value of options exercised	18,600,000	22,800,000
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options	27,100,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 10,000,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	2