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Goodwill and Purchased Intangible Assets, Net - Amortization Expense for Purchased Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Apr. 24, 2015	Apr. 25, 2014	Apr. 26, 2013
Acquired Finite Lived Intangible Assets [Line Items]
Amortization expense	$ 63.7us-gaap_AmortizationOfIntangibleAssets	$ 59.1us-gaap_AmortizationOfIntangibleAssets	$ 85.8us-gaap_AmortizationOfIntangibleAssets
Cost of revenues \| Developed Technology
Acquired Finite Lived Intangible Assets [Line Items]
Amortization expense	62.6	57.1	55.9
Operating expenses \| Customer Contracts/Relationships
Acquired Finite Lived Intangible Assets [Line Items]
Amortization expense	0.7	1.0	25.2
Operating expenses \| Other Purchased Intangibles
Acquired Finite Lived Intangible Assets [Line Items]
Amortization expense	$ 0.4	$ 1.0	$ 4.7