|**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 GrantsESPPThree Months Ended December 31,Nine Months Ended December 31,Nine Months Ended December 31,20132014201320142013Risk-free interest rate1.6%1.1 - 1.9%1.6%0.04 - 0.1%0.1%Expected volatility37 - 42%36 - 40%37 - 42%34 - 35%36 - 37%Weighted-average volatility37%38%37%35%37%Expected term4.5 years4.5 years4.5 years6 - 12 months6 - 12 monthsExpected dividendsNoneNoneNoneNoneNone                  
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|                                                                                   | Stock Option Grants                                                                                                                                                                                                                                                                                                                                                                                                          
|                                                                                   | Three Months Ended December 31,                                                                                                                                                                                                                                                                                                                                                                                              
|                                                                                   | 2013                                                                                                                                                                                                                                                                                                                                                                                                                         
|Risk-free interest rate                                                            | 1.6%                                                                                                                                                                                                                                                                                                                                                                                                                         
|Expected volatility                                                                | 37 - 42%                                                                                                                                                                                                                                                                                                                                                                                                                     
|Weighted-average volatility                                                        | 37                                                                                                                                                                                                                                                                                                                                                                                                                           
|Expected term                                                                      | 4.5 years                                                                                                                                                                                                                                                                                                                                                                                                                    
|Expected dividends                                                                 | None                                                                                                                                                                                                                                                                                                                                                                                                                         
|Schedule Of Stock-Based Compensation Expense By Statement Of Operations            | Three Months Ended December 31,Nine Months Ended December 31,2014201320142013Cost of revenue$1$—$2$1Research and development22256168Marketing and sales671620General and administrative1082922Stock-based compensation expense$39$40$108$111                                                                                                                                                                                 
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|                                                                                   | Three Months Ended December 31,                                                                                                                                                                                                                                                                                                                                                                                              
|                                                                                   | 2014                                                                                                                                                                                                                                                                                                                                                                                                                         
|Cost of revenue                                                                    | $                                                                                                                                                                                                                                                                                                                                                                                                                            
|Research and development                                                           | 22                                                                                                                                                                                                                                                                                                                                                                                                                           
|Marketing and sales                                                                | 6                                                                                                                                                                                                                                                                                                                                                                                                                            
|General and administrative                                                         | 10                                                                                                                                                                                                                                                                                                                                                                                                                           
|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, 20145,311$37.43Granted1,24635.76Exercised(575)19.22Forfeited, cancelled or expired(259)48.28Outstanding as of December 31, 20145,723$38.415.11$69Vested and expected to vest5,438$38.724.89$65Exercisable as of December 31, 20143,718$42.012.94$36
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|Outstanding as of March 31, 2014                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                              
|Granted                                                                            |                                                                                                                                                                                                                                                                                                                                                                                                                              
|Exercised                                                                          |                                                                                                                                                                                                                                                                                                                                                                                                                              
|Forfeited, cancelled or expired                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                              
|Outstanding as of December 31, 2014                                                |                                                                                                                                                                                                                                                                                                                                                                                                                              
|Vested and expected to vest                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                              
|Exercisable as of December 31, 2014                                                |                                                                                                                                                                                                                                                                                                                                                                                                                              
|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, 201413,536$19.70Granted4,16935.93Vested(5,405)19.85Forfeited or cancelled(1,191)23.18Balance as of December 31, 201411,109$25.34                                                                                                                                                                                           
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|Balance as of March 31, 2014                                                       |                                                                                                                                                                                                                                                                                                                                                                                                                              
|Granted                                                                            |                                                                                                                                                                                                                                                                                                                                                                                                                              
|Vested                                                                             |                                                                                                                                                                                                                                                                                                                                                                                                                              
|Forfeited or cancelled                                                             |                                                                                                                                                                                                                                                                                                                                                                                                                              
|Balance as of December 31, 2014                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                              
|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 ValuesBalance as of March 31, 201454$15.39Vested(49)15.39Forfeited or cancelled(5)15.39Balance as of December 31, 2014—$—                                                                                                                                                                                                               
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|Balance as of March 31, 2014                                                       |                                                                                                                                                                                                                                                                                                                                                                                                                              
|Vested                                                                             |                                                                                                                                                                                                                                                                                                                                                                                                                              
|Forfeited or cancelled                                                             |                                                                                                                                                                                                                                                                                                                                                                                                                              
|Balance as of December 31, 2014                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                              
|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, 2014978$24.83Granted19346.96Vested(671)21.45Vested above target19216.80Forfeited or cancelled(29)33.70Balance as of December 31, 2014663$31.97                                                                                                                                                                 
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|Balance as of March 31, 2014                                                       |                                                                                                                                                                                                                                                                                                                                                                                                                              
|Granted                                                                            |                                                                                                                                                                                                                                                                                                                                                                                                                              
|Vested                                                                             |                                                                                                                                                                                                                                                                                                                                                                                                                              
|Vested above target                                                                |                                                                                                                                                                                                                                                                                                                                                                                                                              
|Forfeited or cancelled                                                             |                                                                                                                                                                                                                                                                                                                                                                                                                              
|Balance as of December 31, 2014                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                              

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