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Stock-Based Employee Compensation (Details 4) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Stock Options [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 8.5
Stock Option Activity  
Beginning stock options outstanding (in shares) 17,480,000
Beginning stock options outstanding (in dollars per share) $ 8.20
Granted (in shares) 3,116,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 5.73
Exercised (in shares) (1,565,000) [1]
Exercised (in dollars per share) $ 5.62 [1]
Cancelled (in shares) (6,214,000)
Cancelled (in dollars per share) $ 9.83
Ending stock options outstanding (in shares) 12,817,000
Ending stock options outstanding (in dollars per share) $ 7.12
Ending stock options exercisable (in shares) 7,720,000
Ending stock options exercisable (in dollars per share) $ 7.60
Restricted Stock Units (RSUs) [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Outstanding, Number 2,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms 1 year 2 months 12 days
Restricted Stock Unit Activity  
Beginning units outstanding (in shares) 2,302,000
Beginning units outstanding (in dollars per share) $ 6.98
Granted (in shares) 1,700,000
Granted (in dollars per share) $ 5.77
Released (in shares) (815,000)
Released (in dollars per share) $ 7.13
Forfeited (in shares) (596,000)
Forfeited (in dollars per share) $ 6.44
Ending units outstanding (in shares) 2,591,000
Ending units outstanding (in dollars per share) $ 6.26
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Outstanding, Intrinsic Value $ 16.2
[1] Upon exercise, the Company issues new shares of common stock.