| **Stock-Based Compensation (Tables)**                                              | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
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| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Schedule of assumptions used in the Black-Scholes valuation model                  | The estimated assumptions used in the Black-Scholes valuation model to value our stock option grants and ESPP were as follows: Stock Option Grants ESPP Three Months EndedDecember 31, Nine Months EndedDecember 31, Nine Months EndedDecember 31, 2013 2012 2013 2012 2013 2012Risk-free interest rate1.6% 0.4 - 1.0% 1.6% 0.4 - 1.0% 0.1% 0.1 - 0.2%Expected volatility37 - 42% 40 - 45% 37 - 42% 40 - 46% 36 - 37% 41 - 42%Weighted-average volatility37% 41% 37% 43% 37% 41%Expected term4.5 years 4.3 years 4.5 years 4.4 years 6 - 12 months 6 - 12 monthsExpected dividendsNone None None None None None |
| Schedule Of Assumptions Used In Monte-Carlo Simulation Model                       | The estimated assumptions used in the Monte-Carlo simulation model to value our market-based restricted stock units were as follows:  Three Months Ended December 31, Nine Months Ended December 31, 2012 2013 2012Risk-free interest rate0.3% 0.4% 0.2 - 0.4%Expected volatility33% 16 - 58% 17 - 116%Weighted-average volatility33% 31% 35%Expected dividendsNone None None                                                                                                                                                                                                                                                                                                                                                           |
| Schedule Of Stock-Based Compensation Expense By Statement Of Operations            | The following table summarizes stock-based compensation expense resulting from stock options, restricted stock, restricted stock units and the ESPP included in our Condensed Consolidated Statements of Operations (in millions): Three Months Ended December 31, Nine Months Ended December 31, 2013 2012 2013 2012Cost of revenue$— $— $1 $1Research and development (a)25 25 68 72Marketing and sales (a) 7 7 20 23General and administrative (a)8 7 22 26Stock-based compensation expense$40 $39 $111 $122                                                                                                                                                      |
| Employee Stock Option [Member]                                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Disclosure Of Stock-Based Compensation Arrangements By Stock-Based Payment Award   | The following table summarizes our stock option activity for the nine months ended December 31, 2013: Options(in thousands) Weighted-AverageExercise Price Weighted-AverageRemainingContractual Term(in years) AggregateIntrinsic Value(in millions)Outstanding as of March 31, 20137,802 $34.17    Granted1,010 26.21    Exercised(1,926) 17.95    Forfeited, cancelled or expired(976) 48.48    Outstanding as of December 31, 20135,910 35.72 4.83 $10Vested and expected to vest5,663 36.16 4.62 $10Exercisable as of December 31, 20134,727 38.49 3.69 $8                                                       |
| Restricted Stock Rights [Member]                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Disclosure Of Stock-Based Compensation Arrangements By Stock-Based Payment Award   | The following table summarizes our restricted stock rights activity, excluding performance-based and market-based restricted stock unit activity discussed below, for the nine months ended December 31, 2013: Restricted StockRights(in thousands) Weighted-Average GrantDate Fair ValueBalance as of March 31, 201315,918 $16.85Granted6,853 22.67Vested(5,743) 17.30Forfeited or cancelled(2,280) 17.63Balance as of December 31, 201314,748 19.26                                                                                                                                                                                                                                                                                             |
| Performance Based Restricted Stock Units [Member]                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Disclosure Of Stock-Based Compensation Arrangements By Stock-Based Payment Award   | The following table summarizes our performance-based restricted stock unit activity for the nine months ended December 31, 2013:  Performance-Based RestrictedStock Units(in thousands) Weighted-Average GrantDate Fair ValueBalance as of March 31, 20131,324 $51.54Vested(36) 15.39Forfeited or cancelled(1,234) 48.32Balance as of December 31, 201354 15.39                                                                                                                                                                                                                                                                                                                                                                                   |
| Market-Based Restricted Stock Units [Member]                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Disclosure Of Stock-Based Compensation Arrangements By Stock-Based Payment Award   | The following table summarizes our market-based restricted stock unit activity for the nine months ended December 31, 2013.  Market-BasedRestricted StockUnits(in thousands) Weighted-Average GrantDate Fair ValueBalance as of March 31, 2013925 $19.16Granted555 29.52Vested(304) 16.01Forfeited or cancelled(222) 23.47Balance as of December 31, 2013954 25.19                                                                                                                                                                                                                                                                                                                                                                                |

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| - Definition
Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan.  Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.
+ References
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| - Definition
Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.
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