Balance Sheet Details - Property and Equipment Net (Detail) (USD $) In Millions, unless otherwise specified	Apr. 25, 2014	Apr. 26, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,192.5	$ 2,139.3
Accumulated depreciation and amortization	(1,083.7)	(968.4)
Property and equipment, net	1,108.8	1,170.9
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	265.7	265.5
Buildings and building improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	541.7	534.8
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	102.9	100.3
Computer, production, engineering and other equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	753.8	714.0
Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	369.1	422.6
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	86.4	82.2
Construction-in-progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 72.9	$ 19.9