Statements Of Cash Flows (Supplemental Cash Flows And Non-Cash Investing And Financing Activities) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Apr. 27, 2012	Apr. 29, 2011	Apr. 30, 2010
Non-cash Investing And Financing Activities:
Reclassification of equity component of convertible debt	$ 52.0	$ (114.6)	$ 0
Acquisition of property and equipment on account	31.4	39.3	17.2
Acquisition of property and equipment through long-term financing	3.6	12.6	0
Options assumed from acquired business	0	3.3	0
Taxes on settlement of note hedge	0	0	32.1
Supplemental Cash Flow Information:
Income taxes paid, net of refunds	48.2	27.9	22.8
Interest paid (net of capitalized interest of $1.4 million, $0.0 million and $0.0 million, respectively)	21.4	22.7	22.1
Capitalized interest	$ 1.4	$ 0	$ 0