SHARE-BASED COMPENSATION (Details 2) (USD $)	6 Months Ended
	Sep. 30, 2011 Y
Stock options outstanding and exercisable by exercise price range
Options outstanding (in shares)	9,047,442
Options outstanding - Weighted-average remaining contractual life (in years)	4.44
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 20.63
Options exercisable (in shares)	8,144,840
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 21.35
Range of exercise price per share from $3.69 to $9.62
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of the range (in dollars per share)	$ 3.69
Exercise price per share, high end of the range (in dollars per share)	$ 9.62
Options outstanding (in shares)	275,674
Options outstanding - Weighted-average remaining contractual life (in years)	6.23
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 8.72
Options exercisable (in shares)	165,174
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 8.59
Range of exercise price per share from $10.22 to $15.00
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of the range (in dollars per share)	$ 10.22
Exercise price per share, high end of the range (in dollars per share)	$ 15.00
Options outstanding (in shares)	2,257,932
Options outstanding - Weighted-average remaining contractual life (in years)	5.73
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 12.74
Options exercisable (in shares)	1,636,402
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 12.36
Range of exercise price per share from $15.10 to $19.82
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of the range (in dollars per share)	$ 15.10
Exercise price per share, high end of the range (in dollars per share)	$ 19.82
Options outstanding (in shares)	2,136,988
Options outstanding - Weighted-average remaining contractual life (in years)	4.41
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 16.67
Options exercisable (in shares)	2,006,416
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 16.65
Range of exercise price per share from $20.12 to $25.00
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of the range (in dollars per share)	$ 20.12
Exercise price per share, high end of the range (in dollars per share)	$ 25.00
Options outstanding (in shares)	2,191,433
Options outstanding - Weighted-average remaining contractual life (in years)	4.68
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 22.94
Options exercisable (in shares)	2,151,433
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 22.90
Range of exercise price per share from $25.98 to $29.30
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of the range (in dollars per share)	$ 25.98
Exercise price per share, high end of the range (in dollars per share)	$ 29.30
Options outstanding (in shares)	1,175,275
Options outstanding - Weighted-average remaining contractual life (in years)	2.79
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 26.69
Options exercisable (in shares)	1,175,275
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 26.69
Range of exercise price per share from $30.93 to $39.12
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of the range (in dollars per share)	$ 30.93
Exercise price per share, high end of the range (in dollars per share)	$ 39.12
Options outstanding (in shares)	758,660
Options outstanding - Weighted-average remaining contractual life (in years)	2.46
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 35.70
Options exercisable (in shares)	758,660
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 35.70
Range of exercise price per share from $40.50 to $62.06
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of the range (in dollars per share)	$ 40.50
Exercise price per share, high end of the range (in dollars per share)	$ 62.06
Options outstanding (in shares)	251,480
Options outstanding - Weighted-average remaining contractual life (in years)	2.97
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 44.11
Options exercisable (in shares)	251,480
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 44.11