Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Apr. 27, 2012	Apr. 29, 2011
Consolidated Balance Sheets [Abstract]
Allowances, accounts receivable	$ 0.4	$ 0.5
Preferred stock, par value	$ 0.001	$ 0.001
Preferred Stock, Shares Authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	885,000,000	885,000,000
Common stock, shares issued	468,900,000	473,300,000
Treasury stock, shares	104,300,000	104,300,000