STOCK-BASED COMPENSATION Stock Option Activity (Details) (Stock Options [Member], USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2011 years	Jun. 30, 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	327
Weighted average exercise price of options granted	$ 36.51
Options exercised	(552)
Weighted average exercise price of options exercised	$ 20.87
Options forfeited or expired	(52)
Weighted average exercise price of options forfeited or expired	$ 36.87
Options outstanding at June 30, 2011	5,083
Weighted average exercise price of options outstanding, June 30, 2011	$ 26.68
Weighted average remaining contractual life of options outstanding at June 30, 2011	3.2
Aggregate intrinsic value of options outstanding at June 30, 2011	$ 55,305,000
Vested and expected to vest at June 30, 2011	4,968
Weighted average exercise price of options vested and expected to vest at June 30, 2011	$ 26.56
Weighted average remaining contractual life of options vested and expected to vest at June 30, 2011	3.2
Aggregate intrinsic value of options vested and expected to vest at June 30, 2011	54,715,000
Exercisable at June 30, 2011	3,778
Weighted average exercise price of options exercisable at June 30, 2011	$ 25.89
Weighted average remaining contractual life of options exercisable at June 30, 2011	2.3
Aggregate intrinsic value of options exercisable at June 30, 2011	44,704,000
Total intrinsic value of options exercised	9,100,000	3,700,000
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options	11,500,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 11,000,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1.9