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Segment Geographic and Significant Customer Information - Schedule of Revenues by Geographic Region (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Jul. 31, 2015 | Jul. 25, 2014
Segment Reporting Information [Line Items] |  |
Net revenues | $ 1,335 | $ 1,489
United States, Canada And Latin America (Americas) |  |
Segment Reporting Information [Line Items] |  |
Net revenues | 745 | 831
Europe, Middle East And Africa (EMEA) |  |
Segment Reporting Information [Line Items] |  |
Net revenues | 415 | 445
Asia Pacific (APAC) |  |
Segment Reporting Information [Line Items] |  |
Net revenues | $ 175 | $ 213

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