|**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 RightsThree Months Ended September 30,20182017Risk-free interest rate2.2 - 2.5%1.1 - 1.2%Expected volatility29%28%Weighted-average volatility29%28%Expected term6 - 12 months6 - 12 monthsExpected dividendsNoneNone                                                                                                                                                    
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|                                                                                   | ESPP Purchase Rights                                                                                                                                                                                                                                                                                                                                                                  
|                                                                                   | Three Months Ended September 30,                                                                                                                                                                                                                                                                                                                                                      
|                                                                                   | 2018                                                                                                                                                                                                                                                                                                                                                                                  
|Risk-free interest rate                                                            | 2.2 - 2.5%                                                                                                                                                                                                                                                                                                                                                                            
|Expected volatility                                                                | 29                                                                                                                                                                                                                                                                                                                                                                                    
|Weighted-average volatility                                                        | 29                                                                                                                                                                                                                                                                                                                                                                                    
|Expected term                                                                      | 6 - 12 months                                                                                                                                                                                                                                                                                                                                                                         
|Expected dividends                                                                 | None                                                                                                                                                                                                                                                                                                                                                                                  
|Schedule Of Stock-Based Compensation Expense By Statement Of Operations            | Three Months Ended September 30,Six Months Ended September 30,2018201720182017Cost of revenue$1$1$2$2Research and development39368664Marketing and sales991616General and administrative17163228Stock-based compensation expense$66$62$136$110                                                                                                                                        
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|                                                                                   | Three Months Ended September 30,                                                                                                                                                                                                                                                                                                                                                      
|                                                                                   | 2018                                                                                                                                                                                                                                                                                                                                                                                  
|Cost of revenue                                                                    | $                                                                                                                                                                                                                                                                                                                                                                                     
|Research and development                                                           | 39                                                                                                                                                                                                                                                                                                                                                                                    
|Marketing and sales                                                                | 9                                                                                                                                                                                                                                                                                                                                                                                     
|General and administrative                                                         | 17                                                                                                                                                                                                                                                                                                                                                                                    
|Stock-based compensation expense                                                   | $                                                                                                                                                                                                                                                                                                                                                                                     
|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 PricesWeighted-AverageRemainingContractualTerm   (in years)AggregateIntrinsic Value(in millions)Outstanding as of March 31, 20181,615$30.28Granted2123.80Exercised(184)31.48Outstanding as of September 30, 20181,433$30.285.10$129Vested and expected to vest1,433$30.285.10$129Exercisable as of September 30, 20181,433$30.285.10$129
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|Outstanding as of March 31, 2018                                                   |                                                                                                                                                                                                                                                                                                                                                                                       
|Granted                                                                            |                                                                                                                                                                                                                                                                                                                                                                                       
|Exercised                                                                          |                                                                                                                                                                                                                                                                                                                                                                                       
|Outstanding as of September 30, 2018                                               |                                                                                                                                                                                                                                                                                                                                                                                       
|Vested and expected to vest                                                        |                                                                                                                                                                                                                                                                                                                                                                                       
|Exercisable as of September 30, 2018                                               |                                                                                                                                                                                                                                                                                                                                                                                       
|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, 20185,948$94.57Granted1,626140.68Vested(1,757)81.71Forfeited or cancelled(359)108.16Outstanding as of September 30, 20185,458$111.55                                                                                                                                            
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|Outstanding as of March 31, 2018                                                   |                                                                                                                                                                                                                                                                                                                                                                                       
|Granted                                                                            |                                                                                                                                                                                                                                                                                                                                                                                       
|Vested                                                                             |                                                                                                                                                                                                                                                                                                                                                                                       
|Forfeited or cancelled                                                             |                                                                                                                                                                                                                                                                                                                                                                                       
|Outstanding as of September 30, 2018                                               |                                                                                                                                                                                                                                                                                                                                                                                       
|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   | Performance-Based RestrictedStock Units(in thousands)Weighted-Average GrantDate Fair ValueOutstanding as of March 31, 2018796$110.51Granted——Forfeited or cancelled(217)110.51Outstanding as of September 30, 2018579$110.51                                                                                                                                                          
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|                                                                                   |                                                                                                                                                                                                                                                                                                                                                                                       
|                                                                                   | Performance-Based RestrictedStock Units(in thousands)                                                                                                                                                                                                                                                                                                                                 
|Outstanding as of March 31, 2018                                                   | 796                                                                                                                                                                                                                                                                                                                                                                                   
|Granted                                                                            | —                                                                                                                                                                                                                                                                                                                                                                                     
|Forfeited or cancelled                                                             | (217                                                                                                                                                                                                                                                                                                                                                                                  
|Outstanding as of September 30, 2018                                               | 579                                                                                                                                                                                                                                                                                                                                                                                   
|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, 20181,342$118.35Granted573185.24Vested(415)98.48Forfeited or cancelled(525)135.76Outstanding as of September 30, 2018975$156.76                                                                                                                                     
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|Outstanding as of March 31, 2018                                                   |                                                                                                                                                                                                                                                                                                                                                                                       
|Granted                                                                            |                                                                                                                                                                                                                                                                                                                                                                                       
|Vested                                                                             |                                                                                                                                                                                                                                                                                                                                                                                       
|Forfeited or cancelled                                                             |                                                                                                                                                                                                                                                                                                                                                                                       
|Outstanding as of September 30, 2018                                               |                                                                                                                                                                                                                                                                                                                                                                                       
|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 2015 ProgramMay 2017 ProgramMay 2018 ProgramTotal(in millions)SharesAmountSharesAmountSharesAmountSharesAmountThree months ended September 30, 2018—$——$—2.3$2992.3$299Six months ended September 30, 2018—$—0.6$764.0$5234.6$599Three months ended September 30, 2017—$—1.3$153—$—1.3$153Six months ended September 30, 20170.3$312.4$272—$—2.7$303                              
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|                                                                                   | May 2015 Program                                                                                                                                                                                                                                                                                                                                                                      
|(in millions)                                                                      | Shares                                                                                                                                                                                                                                                                                                                                                                                
|Three months ended September 30, 2018                                              | —                                                                                                                                                                                                                                                                                                                                                                                     
|Six months ended September 30, 2018                                                | —                                                                                                                                                                                                                                                                                                                                                                                     
|Three months ended September 30, 2017                                              | —                                                                                                                                                                                                                                                                                                                                                                                     
|Six months ended September 30, 2017                                                | 0.3                                                                                                                                                                                                                                                                                                                                                                                   

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