STOCKHOLDERS' EQUITY: (Details 3) (USD $)	12 Months Ended
	Mar. 31, 2014
Stock options outstanding and exercisable by exercise price range
Options outstanding (in shares)	4,538,518
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)	$ 20.30
Options exercisable (in shares)	3,461,150
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 21.62
Range of exercise price per share from $6.32 to $8.90
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 10 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 of exercise price per share from $11.08 to $14.42
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)	1,740,249
Options outstanding - Weighted-average remaining contractual life	6 years 3 months
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 13.21
Options exercisable (in shares)	983,048
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 13.00
Range of exercise price per share from $15.10 to $19.76
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)	690,795
Options outstanding - Weighted-average remaining contractual life	2 years 4 months 24 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 16.39
Options exercisable (in shares)	681,013
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 16.37
Range of exercise price per share from $20.44 to $25.00
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of range (in dollars per share)	$ 20.44
Exercise price per share, high end of range (in dollars per share)	$ 25.00
Options outstanding (in shares)	1,214,122
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)	$ 22.68
Options exercisable (in shares)	923,289
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 23.07
Range of exercise price per share from $26.08 to $29.30
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of range (in dollars per share)	$ 26.08
Exercise price per share, high end of range (in dollars per share)	$ 29.30
Options outstanding (in shares)	221,452
Options outstanding - Weighted-average remaining contractual life	8 months 23 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 27.67
Options exercisable (in shares)	221,452
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 27.67
Range of exercise price per share from $32.60 to $39.12
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of range (in dollars per share)	$ 32.60
Exercise price per share, high end of range (in dollars per share)	$ 39.12
Options outstanding (in shares)	487,141
Options outstanding - Weighted-average remaining contractual life	8 months 8 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 36.35
Options exercisable (in shares)	467,589
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 36.50
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)	145,091
Options outstanding - Weighted-average remaining contractual life	1 year 3 months 4 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 41.89
Options exercisable (in shares)	145,091
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 41.89