SHARE-BASED COMPENSATION: (Details 2) (USD $)	9 Months Ended
	Dec. 31, 2012
Stock options outstanding and exercisable by exercise price range
Options outstanding (in shares)	8,368,467
Options outstanding - Weighted-average remaining contractual life	3 years 10 months 13 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 20.74
Options exercisable (in shares)	7,125,099
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 22.00
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)	100,640
Options outstanding - Weighted-average remaining contractual life	5 years 5 months 5 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 8.68
Options exercisable (in shares)	73,640
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 8.60
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)	2,379,967
Options outstanding - Weighted-average remaining contractual life	6 years 7 months 6 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 13.02
Options exercisable (in shares)	1,186,743
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 12.53
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)	1,789,933
Options outstanding - Weighted-average remaining contractual life	3 years 3 months 11 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 16.72
Options exercisable (in shares)	1,766,789
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)	2,093,895
Options outstanding - Weighted-average remaining contractual life	3 years 3 months 29 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 22.92
Options exercisable (in shares)	2,093,895
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)	1,095,987
Options outstanding - Weighted-average remaining contractual life	1 year 8 months 5 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 26.69
Options exercisable (in shares)	1,095,987
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)	668,512
Options outstanding - Weighted-average remaining contractual life	1 year 5 months 16 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 35.81
Options exercisable (in shares)	668,512
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	1 year 9 months 22 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