STOCKHOLDERS' EQUITY: (Details 2) (USD $)	0 Months Ended			12 Months Ended
	May 13, 2013 Stock Option and Equity Compensation Plans	Mar. 31, 2014 Stock Option and Equity Compensation Plans	May 23, 2013 Stock option and equity compensation plan terminated	Mar. 31, 2014 Stock options Multiple	Mar. 31, 2013 Stock options Multiple	Mar. 31, 2012 Stock options Multiple
Share-based compensation
Aggregate number of shares reserved for issuance under equity compensation plans since the inception of such plans		26,400,000
Additional shares authorized for issuance	4,000,000
Shares which remained available for future grants		5,000,000	1,700,000
Per-share weighted-average fair value of the stock options granted (in dollars per share)				$ 6.99	$ 5.00	$ 5.82
Pricing model used for share-based compensation arrangement				binomial lattice	binomial lattice	binomial lattice
Dividend yield (as a percent)				0.00%	0.00%	0.00%
Risk-free interest rate (as a percent)				2.00%	1.70%	2.20%
Expected option life				4 years 3 months 18 days	4 years 6 months	5 years 3 months 18 days
Expected volatility (as a percent)				35.00%	43.00%	44.00%
Suboptimal exercise multiple				1.3	1.4	1.7
Share-based compensation expense				$ 2,300,000	$ 1,900,000	$ 1,100,000
Future share-based compensation expense expected				4,800,000
Period for recognition of unrecognized stock-based compensation expense				4 years
Stock Option Activity - Number of Shares
Outstanding at the beginning of the period (in shares)				8,193,248
Granted (in shares)				321,060
Exercised (in shares)				(3,758,664)
Forfeited or cancelled (in shares)				(217,126)
Outstanding at the end of the period (in shares)				4,538,518	8,193,248
Exercisable at the end of the period (in shares)				3,461,150
Weighted-average exercise price per share
Outstanding at the beginning of the period (in dollars per share)				$ 20.85
Granted (in dollars per share)				$ 22.15
Exercised (in dollars per share)				$ 20.70
Forfeited or cancelled (in dollars per share)				$ 37.04
Outstanding at the end of the period (in dollars per share)				$ 20.30	$ 20.85
Exercisable at the end of the period (in dollars per share)				$ 21.62
Weighted-average remaining contractual term
Outstanding at the end of the period				3 years 11 months 23 days
Exercisable at the end of the period				2 years 8 months 1 day
Aggregate intrinsic value
Exercised				51,505,000	2,700,000	2,400,000
Outstanding at the end of the period				66,314,000
Exercisable at the end of the period				$ 46,526,000