Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Oct. 26, 2012 Y sqft	Apr. 27, 2012
Commitments and Contingencies Disclosure [Line Items]
Future annual minimum lease payments	$ 334.6
Lease period of land, in years	99
Leased office space for headquarters	300,000
Original cost of leased office space	69.6
Percentage of residual guarantee	85.00%
Maximum Debt to Earnings ratio	3
Synthetic lease covenant - minimum unencumbered cash and short term investments amount	300.0
Accrued purchase commitments with contract manufacturers	8.5	3.3
Contract Manufacturers
Commitments and Contingencies Disclosure [Line Items]
Significant commitment	266.7
Capital Purchase Commitments
Commitments and Contingencies Disclosure [Line Items]
Significant commitment	41.5
Other Purchase Commitments
Commitments and Contingencies Disclosure [Line Items]
Significant commitment	$ 190.1
Software | Maximum
Commitments and Contingencies Disclosure [Line Items]
Product warranty term	5 years
Software | Minimum
Commitments and Contingencies Disclosure [Line Items]
Product warranty term	90 days
Hardware | Maximum
Commitments and Contingencies Disclosure [Line Items]
Product warranty term	5 years
Hardware | Minimum
Commitments and Contingencies Disclosure [Line Items]
Product warranty term	1 year