| **Stock-Based Compensation (Tables)**                                              | 6 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                  |   ESPP Purchase Rights  Three Months Ended September 30,  2016 2015Risk-free interest rate 0.5 - 0.6% 0.3 - 0.4%Expected volatility 29 - 32% 32%Weighted-average volatility 31% 32%Expected term 6 - 12 months 6 - 11.5 monthsExpected dividends None None                                                                                                                                                                                                                                                                                                                                                                   |
| Schedule Of Stock-Based Compensation Expense By Statement Of Operations            |  Three Months Ended September 30, Six Months Ended September 30, 2016 2015 2016 2015Cost of revenue$1 $1 $2 $1Research and development27 $25 54 51Marketing and sales8 7 15 12General and administrative12 11 25 25Stock-based compensation expense$48 $44 $96 $89                                                                                                                                                                                                                                                                                                                                       |
| 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, 2016 3,278 $35.09    Granted 3 69.77    Exercised (318) 30.06    Forfeited, cancelled or expired (31) 35.84    Outstanding as of September 30, 2016 2,932 $35.66 5.04 $146Vested and expected to vest 2,874 $35.75 4.99 $143Exercisable as of September 30, 2016 2,337 $36.83 4.44 $114 |
| 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 ValuesOutstanding as of March 31, 2016 7,157 $44.04Granted 2,330 75.31Vested (3,384) 35.43Forfeited or cancelled (364) 55.26Outstanding as of September 30, 2016 5,739 $61.10                                                                                                                                                                                                                                                                                                                                                               |
| 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 ValueOutstanding as of March 31, 2016 636 $64.49Granted 353 98.04Vested (558) 50.08Vested above target 238 44.99Forfeited or cancelled (15) 86.39Outstanding as of September 30, 2016 654 $87.29                                                                                                                                                                                                                                                                                                                          |
| 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 September 30, 2016— $— 1.6 $127 1.6 $127Six months ended September 30, 2016— $— 3.5 $256 3.5 $256Three months ended September 30, 2015— $— 1.8 $126 1.8 $126Six months ended September 30, 20151.0 $57 3.0 $201 4.0 $258                                                                                                                                                                                         |

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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.
+ 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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| - 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.
+ References
No definition available.
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