SHARE-BASED COMPENSATION: (Details 2) (USD $)	9 Months Ended
	Dec. 31, 2013
Stock options outstanding and exercisable by exercise price range
Options outstanding (in shares)	5,074,527
Options outstanding - Weighted-average remaining contractual life	3 years 11 months 26 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 20.59
Options exercisable (in shares)	3,901,170
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 22.02
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)	43,321
Options outstanding - Weighted-average remaining contractual life	4 years 14 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 8.72
Options exercisable (in shares)	43,321
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 8.72
Range of exercise price per share from $11.08 to $15.00
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of range (in dollars per share)	$ 11.08
Exercise price per share, high end of range (in dollars per share)	$ 15.00
Options outstanding (in shares)	1,797,500
Options outstanding - Weighted-average remaining contractual life	6 years 4 months 20 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 13.17
Options exercisable (in shares)	944,310
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 12.89
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)	830,068
Options outstanding - Weighted-average remaining contractual life	2 years 7 months 28 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 16.41
Options exercisable (in shares)	820,286
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 16.4
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)	1,342,504
Options outstanding - Weighted-average remaining contractual life	3 years 11 months 23 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 22.71
Options exercisable (in shares)	1,051,671
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 23.06
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)	357,691
Options outstanding - Weighted-average remaining contractual life	10 months 6 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 27.41
Options exercisable (in shares)	357,691
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 27.41
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)	544,472
Options outstanding - Weighted-average remaining contractual life	10 months 24 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 36.15
Options exercisable (in shares)	524,920
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 36.27
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)	158,971
Options outstanding - Weighted-average remaining contractual life	1 year 4 months 28 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 42.77
Options exercisable (in shares)	158,971
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 42.77