Commitments and Contingencies - Schedule of Warranty Liability Balances (Detail) (USD $) In Millions, unless otherwise specified	Jul. 25, 2014	Apr. 25, 2014	Jul. 26, 2013	Apr. 26, 2013
Standard Product Warranty Accrual, Balance Sheet Classification [Abstract]
Other current liabilities	$ 68.8	$ 73.0
Other long-term liabilities	35.3	37.0
Total	$ 104.1	$ 110.0	$ 119.8	$ 117.2

Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (c)(1),(c)(5)

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Name:	us-gaap_StandardProductWarrantyAccrual
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant