SHARE-BASED COMPENSATION (Details 2) (USD $)	6 Months Ended
	Sep. 30, 2012
Stock options outstanding and exercisable by exercise price range
Options outstanding (in shares)	8,420,429
Options outstanding - Weighted-average remaining contractual life	4 years 1 month 13 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 20.70
Options exercisable (in shares)	7,177,061
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 21.95
Range of exercise price per share from $6.32 to $9.62
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of range (in dollars per share)	$ 6.32
Exercise price per share, high end of range (in dollars per share)	$ 9.62
Options outstanding (in shares)	101,950
Options outstanding - Weighted-average remaining contractual life	5 years 7 months 13 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 8.65
Options exercisable (in shares)	74,950
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 8.56
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 range (in dollars per share)	$ 10.22
Exercise price per share, high end of range (in dollars per share)	$ 15.00
Options outstanding (in shares)	2,420,064
Options outstanding - Weighted-average remaining contractual life	6 years 9 months 18 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 13.00
Options exercisable (in shares)	1,226,840
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 12.52
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 range (in dollars per share)	$ 15.10
Exercise price per share, high end of range (in dollars per share)	$ 19.82
Options outstanding (in shares)	1,794,643
Options outstanding - Weighted-average remaining contractual life	3 years 6 months 14 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 16.72
Options exercisable (in shares)	1,771,499
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 16.70
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 range (in dollars per share)	$ 20.12
Exercise price per share, high end of range (in dollars per share)	$ 25.00
Options outstanding (in shares)	2,095,514
Options outstanding - Weighted-average remaining contractual life	3 years 7 months 10 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 22.92
Options exercisable (in shares)	2,095,514
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 22.92
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 range (in dollars per share)	$ 25.98
Exercise price per share, high end of range (in dollars per share)	$ 29.30
Options outstanding (in shares)	1,097,312
Options outstanding - Weighted-average remaining contractual life	1 year 11 months 12 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 26.69
Options exercisable (in shares)	1,097,312
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 range (in dollars per share)	$ 30.93
Exercise price per share, high end of range (in dollars per share)	$ 39.12
Options outstanding (in shares)	671,413
Options outstanding - Weighted-average remaining contractual life	1 year 8 months 16 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 35.81
Options exercisable (in shares)	671,413
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 35.81
Range of exercise price per share from $40.88 to $62.06
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of range (in dollars per share)	$ 40.88
Exercise price per share, high end of range (in dollars per share)	$ 62.06
Options outstanding (in shares)	239,533
Options outstanding - Weighted-average remaining contractual life	2 years 25 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 44.07
Options exercisable (in shares)	239,533
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 44.07