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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified				9 Months Ended
	Jan. 24, 2014	Apr. 26, 2013	Jan. 24, 2014 Contract Manufacturers	Jan. 24, 2014 Software Maximum	Jan. 24, 2014 Software Minimum	Jan. 24, 2014 Hardware Maximum	Jan. 24, 2014 Hardware Minimum	Jan. 24, 2014 Capital Purchase Commitments	Jan. 24, 2014 Other Purchase Commitments
Commitments and Contingencies Disclosure [Line Items]
Future annual minimum lease payments	$ 216.1
Accrued purchase commitments with contract manufacturers	15.4	9.5
Significant commitment			$ 240.2					$ 44.1	$ 203.2
Product warranty term				5 years	90 days	5 years	1 year

Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

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