Stock-Based Compensation (Tables)
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6 Months Ended |
Sep. 30, 2016 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Schedule of assumptions used in the Black-Scholes valuation model |
| | | | | | | | | | ESPP Purchase Rights | | | Three Months Ended
September 30, | | | 2016 | | 2015 | Risk-free interest rate | | 0.5 - 0.6% |
| | 0.3 - 0.4% |
| Expected volatility | | 29 - 32% |
| | 32 | % | Weighted-average volatility | | 31 | % | | 32 | % | Expected term | | 6 - 12 months |
| | 6 - 11.5 months |
| Expected dividends | | None |
| | None |
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| Schedule Of Stock-Based Compensation Expense By Statement Of Operations |
| | | | | | | | | | | | | | | | | | Three Months Ended
September 30, | | Six Months Ended
September 30, | | 2016 | | 2015 | | 2016 | | 2015 | Cost of revenue | $ | 1 |
| | $ | 1 |
| | $ | 2 |
| | $ | 1 |
| Research and development | 27 |
| | $ | 25 |
| | 54 |
| | 51 |
| Marketing and sales | 8 |
| | 7 |
| | 15 |
| | 12 |
| General and administrative | 12 |
| | 11 |
| | 25 |
| | 25 |
| Stock-based compensation expense | $ | 48 |
| | $ | 44 |
| | $ | 96 |
| | $ | 89 |
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| Employee Stock Option [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Disclosure Of Stock-Based Compensation Arrangements By Stock-Based Payment Award |
| | | | | | | | | | | | | | | | | Options (in thousands) | | Weighted- Average Exercise Prices | | Weighted- Average Remaining Contractual Term (in years) | | Aggregate Intrinsic Value (in millions) | Outstanding as of March 31, 2016 | | 3,278 |
| | $ | 35.09 |
| | | | | Granted | | 3 |
| | 69.77 |
| | | | | Exercised | | (318 | ) | | 30.06 |
| | | | | Forfeited, cancelled or expired | | (31 | ) | | 35.84 |
| | | | | Outstanding as of September 30, 2016 | | 2,932 |
| | $ | 35.66 |
| | 5.04 | | $ | 146 |
| Vested and expected to vest | | 2,874 |
| | $ | 35.75 |
| | 4.99 | | $ | 143 |
| Exercisable as of September 30, 2016 | | 2,337 |
| | $ | 36.83 |
| | 4.44 | | $ | 114 |
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| Restricted Stock Rights [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Disclosure Of Stock-Based Compensation Arrangements By Stock-Based Payment Award |
| | | | | | | | | | | Restricted Stock Rights (in thousands) | | Weighted- Average Grant Date Fair Values | Outstanding as of March 31, 2016 | | 7,157 |
| | $ | 44.04 |
| Granted | | 2,330 |
| | 75.31 |
| Vested | | (3,384 | ) | | 35.43 |
| Forfeited or cancelled | | (364 | ) | | 55.26 |
| Outstanding as of September 30, 2016 | | 5,739 |
| | $ | 61.10 |
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| Market-Based Restricted Stock Units [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Disclosure Of Stock-Based Compensation Arrangements By Stock-Based Payment Award |
| | | | | | | | | | | Market-Based Restricted Stock Units (in thousands) | | Weighted- Average Grant Date Fair Value | Outstanding as of March 31, 2016 | | 636 |
| | $ | 64.49 |
| Granted | | 353 |
| | 98.04 |
| Vested | | (558 | ) | | 50.08 |
| Vested above target | | 238 |
| | 44.99 |
| Forfeited or cancelled | | (15 | ) | | 86.39 |
| Outstanding as of September 30, 2016 | | 654 |
| | $ | 87.29 |
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| Repurchase Program, Total [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Disclosure Of Stock-Based Compensation Arrangements By Stock-Based Payment Award |
| | | | | | | | | | | | | | | | | | | | | | May 2014 Program | | May 2015 Program | | Total | (in millions) | Shares | | Amount | | Shares | | Amount | | Shares | | Amount | Three months ended September 30, 2016 | — |
| | $ | — |
| | 1.6 | | $ | 127 |
| | 1.6 | | $ | 127 |
| Six months ended September 30, 2016 | — |
| | $ | — |
| | 3.5 | | $ | 256 |
| | 3.5 | | $ | 256 |
| Three months ended September 30, 2015 | — |
| | $ | — |
| | 1.8 |
| | $ | 126 |
| | 1.8 | | $ | 126 |
| Six months ended September 30, 2015 | 1.0 | | $ | 57 |
| | 3.0 |
| | $ | 201 |
| | 4.0 | | $ | 258 |
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