Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Apr. 25, 2014	Apr. 26, 2013	Apr. 27, 2012
Commitments and Contingencies Disclosure [Line Items]
Rent expense	$ 65.5	$ 64.9	$ 88.2
Accrued purchase commitments with contract manufacturers	11.5	9.5
Financial guarantees not recorded on consolidated balance sheets	12.6
Software
Commitments and Contingencies Disclosure [Line Items]
Product warranty term	90 days
Hardware
Commitments and Contingencies Disclosure [Line Items]
Product warranty term	3 years
Maximum
Commitments and Contingencies Disclosure [Line Items]
Terms of recourse leases	3 years
Capital Purchase Commitments
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	31.1
Other Purchase Commitments
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	174.1
Contract Manufacturers
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	$ 258.4