Significant Accounting Policies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Apr. 29, 2011	Apr. 30, 2010
Fiscal year minimum, weeks	52
Fiscal year maximum, weeks		53
New Accounting Pronouncement, Effect of Change on Net Revenues	$ 129.2
New Accounting Pronouncement, Effect of Change on Net Income	$ 53.0
Maximum [Member] | Customer Relationships [Member]
Estimated useful life of amortization of intangible assets, years	8
Maximum [Member] | Developed Technology [Member]
Estimated useful life of amortization of intangible assets, years	6
Maximum [Member] | Covenants Not to Compete [Member]
Estimated useful life of amortization of intangible assets, years	3
Maximum [Member] | Trademarks and Tradenames [Member]
Estimated useful life of amortization of intangible assets, years	7
Minimum [Member] | Customer Relationships [Member]
Estimated useful life of amortization of intangible assets, years	2
Minimum [Member] | Developed Technology [Member]
Estimated useful life of amortization of intangible assets, years	4
Minimum [Member] | Covenants Not to Compete [Member]
Estimated useful life of amortization of intangible assets, years	1
Minimum [Member] | Trademarks and Tradenames [Member]
Estimated useful life of amortization of intangible assets, years	2
Patents [Member]
Estimated useful life of amortization of intangible assets, years	5