Balance Sheet Details - Deferred Revenue (Detail) (USD $) In Millions, unless otherwise specified	Apr. 25, 2014	Apr. 26, 2013
Deferred Revenue Arrangement [Line Items]
Short-term	$ 1,653.8	$ 1,563.3
Long-term	1,446.4	1,446.2
Short-term and long-term deferred revenue, Total	3,100.2	3,009.5
Product
Deferred Revenue Arrangement [Line Items]
Short-term and long-term deferred revenue, Total	23.4	15.7
Software entitlements and maintenance and service
Deferred Revenue Arrangement [Line Items]
Short-term and long-term deferred revenue, Total	$ 3,076.8	$ 2,993.8