Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Apr. 27, 2012	Apr. 29, 2011
Commitments And Contingencies [Line Items]
Accrued purchase commitments with contract manufacturers	$ 3.3	$ 4.5
Future annual minimum lease payments	331.8
Lease period of land, in years	99 years
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
Lease commitments year one	1.7
Leasing arrangements residual guarantee	59.1
Financial guarantees not recorded on consolidated balance sheets	13.1
Deferred revenue on recourse financing arrangements	2,815.9	2,314.9
Capital Purchase Commitments [Member]
Commitments And Contingencies [Line Items]
Significant commitment	46.0
Other Purchase Commitments [Member]
Commitments And Contingencies [Line Items]
Significant commitment	163.5
Contract Manufacturers [Member]
Commitments And Contingencies [Line Items]
Significant commitment	$ 250.1
Maximum [Member] | Software [Member]
Commitments And Contingencies [Line Items]
Product warranty term	5 years
Maximum [Member] | Hardware [Member]
Commitments And Contingencies [Line Items]
Product warranty term	5 years
Minimum [Member] | Software [Member]
Commitments And Contingencies [Line Items]
Product warranty term	90 days
Minimum [Member] | Hardware [Member]
Commitments And Contingencies [Line Items]
Product warranty term	1 year