STOCKHOLDERS' EQUITY: (Details 2) (USD $)	12 Months Ended
	Mar. 31, 2012 Multiple Y	Mar. 31, 2011 Multiple Y	Mar. 31, 2010 Y
Stock options
Weighted-average fair value assumptions
Pricing model used for valuation of options	binomial lattice	binomial lattice	binomial lattice
Dividend yield (as a percent)	0.00%	0.00%	0.00%
Risk-free interest rate (as a percent)	2.20%	3.40%	3.50%
Expected option life (in years)	5.3	5.6	5.4
Expected volatility (as a percent)	44.00%	52.00%	54.00%
Suboptimal exercise multiple	1.7	1.9
Per-share weighted-average fair value of the stock options granted (in dollars per share)	$ 5.82	$ 7.54	$ 4.61
Expense related to stock options
Share-based compensation expense	$ 1,100,000	$ 2,400,000	$ 2,400,000
Future share-based compensation expense expected	4,400,000
Period for recognition of unrecognized stock-based compensation expense (in years)	4
Option Activity - Number of Shares
Outstanding at the beginning of the period (in shares)	9,526,989
Granted (in shares)	884,534
Exercised (in shares)	(723,733)
Forfeited or cancelled (in shares)	(1,365,713)
Outstanding at the end of the period (in shares)	8,322,077	9,526,989
Exercisable at the end of the period (in shares)	7,390,173
Weighted-average exercise price per share
Outstanding at the beginning of the period (in dollars per share)	$ 20.75
Outstanding at the end of the period (in dollars per share)	$ 20.91	$ 20.75
Exercisable at the end of the period (in dollars per share)	$ 21.84
Weighted-average remaining contractual term (in years)
Outstanding at the end of the period (in years)	4.13
Exercisable at the end of the period (in years)	3.49
Aggregate Intrinsic Value (in thousands)
Exercised	2,355,000	600,000	1,100,000
Outstanding at the end of the period	4,373,000
Exercisable at the end of the period	$ 3,190,000
Stock Option and Equity Compensation Plans
Share-based compensation
Aggregate number of shares reserved for issuance under equity compensation plans since the inception of such plans	38,200,000
Shares available for future grants	5,600,000