| **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                  |   Stock Option Grants ESPP  Nine Months Ended December 31, Nine Months Ended December 31,  2014 2015 2014Risk-free interest rate 1.1 -1.9% 0.3 - 0.4% 0.04 - 0.1%Expected volatility 36 - 40% 32% 34 - 35%Weighted-average volatility 38% 32% 35%Expected term 4.5 years 6 - 11.5 months 6 - 12 monthsExpected dividends None None None                                                                                                                                                                                                                                             |
| Schedule Of Stock-Based Compensation Expense By Statement Of Operations            |  Three Months Ended December 31, Nine Months Ended December 31, 2015 2014 2015 2014Cost of revenue$— $1 $1 $2Research and development26 $22 77 61Marketing and sales5 6 17 16General and administrative11 10 36 29Stock-based compensation expense$42 $39 $131 $108                                                                                                                                                                                                                                                                                                                               |
| 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   |   Options(in thousands) Weighted-AverageExercise Prices Weighted-AverageRemainingContractualTerm   (in years) AggregateIntrinsic Value(in millions)Outstanding as of March 31, 2015 4,920 $37.44    Granted 4 66.72    Exercised (1,473) 43.92    Forfeited, cancelled or expired (52) 35.76    Outstanding as of December 31, 2015 3,399 $34.69 5.78 $116Vested and expected to vest 3,241 $34.84 5.67 $110Exercisable as of December 31, 2015 2,263 $36.18 4.57 $74 |
| 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   |   RestrictedStock Rights(in thousands) Weighted-Average GrantDate Fair ValuesBalance as of March 31, 2015 10,855 $26.20Granted 2,743 64.45Vested (5,520) 21.66Forfeited or cancelled (816) 34.16Balance as of December 31, 2015 7,262 $43.20                                                                                                                                                                                                                                                                                                                                                                      |
| 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   |   Market-BasedRestricted  StockUnits(in thousands) Weighted-Average  GrantDate Fair ValueBalance as of March 31, 2015 663 $31.82Granted 395 79.81Vested (742) 25.77Vested above target 371 25.77Forfeited or cancelled (51) 40.10Balance as of December 31, 2015 636 $64.49                                                                                                                                                                                                                                                                                                                                  |
| Repurchase Program, Total [Member]                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Disclosure Of Stock-Based Compensation Arrangements By Stock-Based Payment Award   |  May 2014 Program May 2015 Program Total(in millions)Shares Amount Shares Amount Shares AmountThree months ended December 31, 2015— $— 1.8 $126 1.8 $126Nine months ended December 31, 20151.0 $57 4.8 $327 5.8 $384Three months ended December 31, 20142.5 $97 — $— 2.5 $97Nine months ended December 31, 20146.5 $242 — $— 6.5 $242                                                                                                                                                                                            |

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| - Definition
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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.
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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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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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