|**Stock-Based Compensation And Employee Benefit Plans (Tables)**                   | 12 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 GrantsESPPYear Ended March 31,Year Ended March 31,20152014201620152014Risk-free interest rate1.1 -1.9%1.6%0.3 - 0.6%0.04 - 0.2%0.1%Expected volatility36 - 40%37 - 42%32 - 36%30 - 35%36 - 38%Weighted-average volatility38%37%33%34%38%Expected term4.5 years4.5 years6 - 12 months6 - 12 months6 - 12 monthsExpected dividendsNoneNoneNoneNoneNone                                                                                                                                                                                                                                  
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|Risk-free interest rate                                                            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Expected volatility                                                                |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Weighted-average volatility                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Expected term                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Expected dividends                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Schedule Of Assumptions Used In Monte-Carlo Simulation Model                       | The assumptions used in the Monte-Carlo simulation model to value our market-based restricted stock units were as follows:Year Ended March 31,201620152014Risk-free interest rate1.0%0.9%0.4%Expected volatility14 - 53%16 - 79%16 - 58%Weighted-average volatility26%30%31%Expected dividendsNoneNoneNone                                                                                                                                                                                                                                                                                         
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|                                                                                   | Year Ended March 31,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|                                                                                   | 2016                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Risk-free interest rate                                                            | 1.0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Expected volatility                                                                | 14 - 53%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Weighted-average volatility                                                        | 26                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Expected dividends                                                                 | 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 units, market-based restricted stock units, and the ESPP included in our Consolidated Statements of Operations (in millions):Year Ended March 31,201620152014Cost of revenue$2$2$2Research and development1038290Marketing and sales242126General and administrative493932Stock-based compensation expense$178$144$150                                                                                                                                                              
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|Cost of revenue                                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Research and development                                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Marketing and sales                                                                |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|General and administrative                                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Stock-based compensation expense                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Summary Of Outstanding And Exercisable Stock Options                               | The following table summarizes outstanding and exercisable stock options as ofMarch 31, 2016:Options OutstandingOptions ExercisableRange ofExercise PricesNumberof Shares(in thousands)Weighted-AverageRemainingContractualTerm  (in years)Weighted-AverageExercisePricesPotentialDilutionNumberof Shares(in thousands)Weighted-AverageExercisePricesPotentialDilution$11.53 - $23.833173.39$19.100.1%313$19.180.1%26.25 - 26.251,0007.5826.250.3%58026.250.2%27.49 - 35.708538.2135.500.3%34335.210.1%36.00 - 59.631,1082.4747.330.4%97048.780.3%$11.53 - $59.633,2785.61$35.091.1%2,206$36.550.7%
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|Range ofExercise Prices                                                            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|$11.53 - $23.83                                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|26.25 - 26.25                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|27.49 - 35.70                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|36.00 - 59.63                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|$11.53 - $59.63                                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Shares Repurchased and Retired                                                     | The following table summarizes total shares repurchased duringfiscal years 2016 and 2015:May 2014 ProgramMay 2015 ProgramFebruary 2016 ProgramTotal(In millions)SharesAmountSharesAmountSharesAmountSharesAmountFiscal Year 20158.2$337—$——$—8.2$337Fiscal Year 20161.0$576.9$4617.8$50015.7$1,018                                                                                                                                                                                                                                                                                                 
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|                                                                                   | May 2014 Program                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|(In millions)                                                                      | Shares                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Fiscal Year 2015                                                                   | 8.2                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Fiscal Year 2016                                                                   | 1.0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|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 fiscal year endedMarch 31, 2016:Options(in thousands)Weighted-AverageExercise PricesWeighted-AverageRemainingContractualTerm   (in years)AggregateIntrinsic Value(in millions)Outstanding as of March 31, 20154,920$37.44Granted666.08Exercised(1,594)42.43Forfeited, cancelled or expired(54)35.61Outstanding as of March 31, 20163,278$35.095.61$101Vested and expected to vest3,163$35.225.53$97Exercisable as of March 31, 20162,206$36.554.46$65                                                                             
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|Outstanding as of March 31, 2015                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Granted                                                                            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Exercised                                                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Forfeited, cancelled or expired                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Outstanding as of March 31, 2016                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Vested and expected to vest                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Exercisable as of March 31, 2016                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|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   | Each restricted stock right granted reduces the number of shares available for grant by1.43shares under our Equity Plan. The following table summarizes our restricted stock rights activity, excluding market-based restricted stock unit activity which is discussed below, for the fiscal year endedMarch 31, 2016:RestrictedStock Rights(in thousands)Weighted-Average GrantDate Fair ValuesBalance as of March 31, 201510,855$26.20Granted3,03564.40Vested(5,809)22.65Forfeited or cancelled(924)35.78Balance as of March 31, 20167,157$44.04                                                 
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|Balance as of March 31, 2015                                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Granted                                                                            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Vested                                                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Forfeited or cancelled                                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Balance as of March 31, 2016                                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|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 year endedMarch 31, 2016:Market-BasedRestricted  StockUnits(in thousands)Weighted-Average  GrantDate Fair ValueBalance as of March 31, 2015663$31.82Granted39579.81Vested(742)25.77Vested above target37125.77Forfeited or cancelled(51)40.10Balance as of March 31, 2016636$64.49                                                                                                                                                                                                                          
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|Balance as of March 31, 2015                                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Granted                                                                            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Vested                                                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Vested above target                                                                |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Forfeited or cancelled                                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Balance as of March 31, 2016                                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    

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