Balance Sheet Details - Deferred Revenue (Detail) (USD $) In Millions, unless otherwise specified	Jul. 25, 2014	Apr. 25, 2014
Deferred Revenue Arrangement [Line Items]
Short-term	$ 1,656.4	$ 1,653.8
Long-term	1,419.9	1,446.4
Short-term and long-term deferred revenue, Total	3,076.3	3,100.2
Product
Deferred Revenue Arrangement [Line Items]
Short-term and long-term deferred revenue, Total	31.9	23.4
Software entitlements and maintenance and service
Deferred Revenue Arrangement [Line Items]
Short-term and long-term deferred revenue, Total	$ 3,044.4	$ 3,076.8