SHARE-BASED COMPENSATION: (Details 2) (USD $)	3 Months Ended
	Jun. 30, 2014
Stock options outstanding and exercisable by exercise price range
Options outstanding (in shares)	4,384,967
Options outstanding - Weighted-average remaining contractual life	4 years 8 months 23 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 18.67
Options exercisable (in shares)	3,152,528
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 19.09
Range One of Exercise Prices [Member]
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)	$ 8.90
Options outstanding (in shares)	39,668
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)	$ 8.74
Options exercisable (in shares)	39,668
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 8.74
Range Two of Exercise Prices [Member]
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)	$ 14.42
Options outstanding (in shares)	1,728,984
Options outstanding - Weighted-average remaining contractual life	6 years 4 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 13.21
Options exercisable (in shares)	1,115,733
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 13.04
Range Three of Exercise Prices [Member]
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)	$ 19.76
Options outstanding (in shares)	686,167
Options outstanding - Weighted-average remaining contractual life	2 years 2 months 12 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 16.38
Options exercisable (in shares)	686,167
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 16.38
Range Four of Exercise Prices [Member]
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of range (in dollars per share)	$ 20.44
Exercise price per share, high end of range (in dollars per share)	$ 25.00
Options outstanding (in shares)	1,590,000
Options outstanding - Weighted-average remaining contractual life	5 years 1 month 24 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 22.32
Options exercisable (in shares)	990,364
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 22.95
Range Five of Exercise Prices [Member]
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of range (in dollars per share)	$ 26.33
Exercise price per share, high end of range (in dollars per share)	$ 29.30
Options outstanding (in shares)	115,358
Options outstanding - Weighted-average remaining contractual life	1 year 11 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 27.94
Options exercisable (in shares)	115,358
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 27.94
Range Six of Exercise Prices [Member]
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of range (in dollars per share)	$ 32.85
Exercise price per share, high end of range (in dollars per share)	$ 35.16
Options outstanding (in shares)	91,812
Options outstanding - Weighted-average remaining contractual life	2 years 9 months 4 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 34.45
Options exercisable (in shares)	72,260
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 34.88
Range Seven of Exercise Prices [Member]
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)	132,978
Options outstanding - Weighted-average remaining contractual life	1 year 1 month 17 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 41.82
Options exercisable (in shares)	132,978
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 41.82