Balance Sheet Detail (Amortization Expense) (Details) (USD $) In Millions	12 Months Ended
Apr. 29, 2011	Apr. 30, 2010	Apr. 24, 2009
Balance Sheet Detail
Amortization expense	$ 37.9	$ 36.6	$ 32.6

The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Name:	us-gaap_AdjustmentForAmortization
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration