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Goodwill and Purchased Intangible Assets, Net (Tables) | 12 Months Ended
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Apr. 28, 2017
Goodwill And Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill Activity | Goodwill activity is summarized as follows (in millions):
Balance as of April 24, 2015 |  | $ | 1,027 |
Goodwill acquired |  |  | 649 |
Balance as of April 29, 2016 |  |  | 1,676 |
Goodwill acquired |  |  | 8 |
Balance as of April 28, 2017 |  | $ | 1,684 |
Purchased Intangible Assets | Purchased intangible assets are summarized below (in millions):
|  | April 28, 2017 |  |  | April 29, 2016 |
|  | Gross |  |  | Accumulated |  |  | Net |  |  | Gross |  |  | Accumulated |  |  | Net |
|  | Assets |  |  | Amortization |  |  | Assets |  |  | Assets |  |  | Amortization |  |  | Assets |
Developed technology |  | $ | 148 |  |  | $ | (44 | ) |  | $ | 104 |  |  | $ | 403 |  |  | $ | (289 | ) |  | $ | 114 |
Customer contracts/relationships |  |  | 43 |  |  |  | (19 | ) |  |  | 24 |  |  |  | 46 |  |  |  | (7 | ) |  |  | 39 |
Other purchased intangibles |  |  | 9 |  |  |  | (6 | ) |  |  | 3 |  |  |  | 10 |  |  |  | (2 | ) |  |  | 8 |
Total intangible assets subject to amortization |  |  | 200 |  |  |  | (69 | ) |  |  | 131 |  |  |  | 459 |  |  |  | (298 | ) |  |  | 161 |
In-process research and development |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 19 |  |  |  | — |  |  |  | 19 |
Total purchased intangible assets |  | $ | 200 |  |  | $ | (69 | ) |  | $ | 131 |  |  | $ | 478 |  |  | $ | (298 | ) |  | $ | 180 |
Amortization Expense for Purchased Intangible Assets | Amortization expense for purchased intangible assets is summarized below (in millions):
|  | Year Ended |  |  | Statement of
|  | April 28, 2017 |  |  | April 29, 2016 |  |  | April 24, 2015 |  |  | Operations Classifications
Developed technology |  | $ | 29 |  |  | $ | 61 |  |  | $ | 63 |  |  | Cost of revenues
Customer contracts/relationships |  |  | 14 |  |  |  | 5 |  |  |  | 1 |  |  | Operating expenses
Other purchased intangibles |  |  | 5 |  |  |  | 1 |  |  |  | — |  |  | Operating expenses
Total |  | $ | 48 |  |  | $ | 67 |  |  | $ | 64 |  |  |
Future Amortization Expense Related to Purchased Intangible Assets | As of April 28, 2017, future amortization expense related to purchased intangible assets is as follows (in millions):
Fiscal Year |  | Amount |
2018 |  | $ | 49 |
2019 |  |  | 42 |
2020 |  |  | 25 |
2021 |  |  | 15 |
Total |  | $ | 131 |

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