Balance Sheet Details - Deferred Revenue (Detail) (USD $) In Millions, unless otherwise specified	Oct. 25, 2013	Apr. 26, 2013
Deferred Revenue Arrangement [Line Items]
Short-term	$ 1,525.8	$ 1,563.3
Long-term	1,406.1	1,446.2
Short-term and long-term deferred revenue, Total	2,931.9	3,009.5
Product
Deferred Revenue Arrangement [Line Items]
Short-term and long-term deferred revenue, Total	26.9	15.7
Software entitlements and maintenance and service
Deferred Revenue Arrangement [Line Items]
Short-term and long-term deferred revenue, Total	$ 2,905.0	$ 2,993.8