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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified			3 Months Ended
	Jul. 26, 2013	Apr. 26, 2013	Jul. 26, 2013 Software Maximum	Jul. 26, 2013 Software Minimum	Jul. 26, 2013 Hardware Maximum	Jul. 26, 2013 Hardware Minimum	Jul. 26, 2013 Capital Purchase Commitments	Jul. 26, 2013 Other Purchase Commitments	Jul. 26, 2013 Contract Manufacturers
Commitments and Contingencies Disclosure [Line Items]
Future annual minimum lease payments	$ 217.1
Accrued purchase commitments with contract manufacturers	9.3	9.5
Significant commitment							$ 71.5	$ 181.2	$ 336.3
Product warranty term			5 years	90 days	5 years	1 year

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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- Definition

The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity has agreed to expend funds to procure goods or services from one or more suppliers, other than under a long-term purchase commitment or an unconditional purchase obligation.

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