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Goodwill and Purchased Intangible Assets, Net (Tables) | 12 Months Ended
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Apr. 24, 2015
Goodwill And Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill Activity | Goodwill activity is summarized as follows (in millions):
Balance as of April 26, 2013 |  | $ | 988.1 |
Goodwill acquired |  |  | — |
Balance as of April 25, 2014 |  |  | 988.1 |
Goodwill acquired |  |  | 39.3 |
Balance as of April 24, 2015 |  | $ | 1,027.4 |
Purchased Intangible Assets, Net | Purchased intangible assets, net are summarized below (in millions):
|  | April 24, 2015 |  |  | April 25, 2014 |
|  | Gross |  |  | Accumulated |  |  | Net |  |  | Gross |  |  | Accumulated |  |  | Net |
|  | Assets |  |  | Amortization |  |  | Assets |  |  | Assets |  |  | Amortization |  |  | Assets |
Developed technology |  | $ | 312.4 |  |  | $ | (225.2 | ) |  | $ | 87.2 |  |  | $ | 283.0 |  |  | $ | (162.6 | ) |  | $ | 120.4 |
Customer contracts/relationships |  |  | 5.0 |  |  |  | (2.7 | ) |  |  | 2.3 |  |  |  | 9.6 |  |  |  | (9.0 | ) |  |  | 0.6 |
Other purchased intangibles |  |  | 2.9 |  |  |  | (2.9 | ) |  |  | — |  |  |  | 4.5 |  |  |  | (4.0 | ) |  |  | 0.5 |
Total purchased intangible assets |  | $ | 320.3 |  |  | $ | (230.8 | ) |  | $ | 89.5 |  |  | $ | 297.1 |  |  | $ | (175.6 | ) |  | $ | 121.5 |
Amortization Expense for Purchased Intangible Assets | Amortization expense for purchased intangible assets is summarized below (in millions):
|  | Year Ended |  |  | Statement of
|  | April 24, 2015 |  |  | April 25, 2014 |  |  | April 26, 2013 |  |  | Operations Classifications
Developed technology |  | $ | 62.6 |  |  | $ | 57.1 |  |  | $ | 55.9 |  |  | Cost of revenues
Customer contracts/relationships |  |  | 0.7 |  |  |  | 1.0 |  |  |  | 25.2 |  |  | Operating expenses
Other purchased intangibles |  |  | 0.4 |  |  |  | 1.0 |  |  |  | 4.7 |  |  | Operating expenses
Total |  | $ | 63.7 |  |  | $ | 59.1 |  |  | $ | 85.8 |  |  |
Future Amortization Expense Related to Purchased Intangible Assets | As of April 24, 2015, future amortization expense related to purchased intangible assets is as follows (in millions):
Fiscal Year |  | Amount |
2016 |  | $ | 58.4 |
2017 |  |  | 13.9 |
2018 |  |  | 9.4 |
2019 |  |  | 5.2 |
2020 |  |  | 2.6 |
Total |  | $ | 89.5 |

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