STOCK-BASED COMPENSATION Restricted Stock Activity (Details) (Restricted Stock [Member], USD $)	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Non-vested Restricted Stock at March 31, 2011	688,000
Restricted stock granted	391,000
Restricted stock vested	(202,000)
Restricted stock forfeited	(62,000)
Non-vested Restricted Stock at March 31, 2012	815,000	688,000
Weighted Average Grant Date Fair Value of Non-Vested Restricted Stock at March 31, 2011	$ 29.52
Weighted average grant date fair value of restricted stock granted	$ 36.37	$ 33.54	$ 24.62
Weighted average grant date fair value of restricted stock vested	$ 27.35
Weighted average grant date fair value of restricted stock forfeited	$ 30.91
Weighted Average Grant Date Fair Value of Non-Vested Restricted Stock at March 31, 2012	$ 33.37	$ 29.52