Quarterly Results 2 (Details) (USD $)	3 Months Ended				12 Months Ended
	Apr. 29, 2012	Jan. 25, 2012	Oct. 26, 2011	Jul. 27, 2011	Apr. 29, 2012		Apr. 27, 2011		Apr. 28, 2010
Quarterly Financial Information Disclosure [Abstract]
Pre-tax charges	$ 112,700,000	$ 33,800,000	$ 37,300,000	$ 40,500,000	$ 224,317,000	[1]	$ 0	[1]	$ 37,665,000	[1]
After-tax changes	$ 86,200,000	$ 22,800,000	$ 25,500,000	$ 28,400,000	$ 162,900,000
EPS impact	$ 0.27	$ 0.07	$ 0.08	$ 0.09	$ 0.50

[1] See Note 3 for further details on Fiscal 2012 productivity initiatives. Fiscal 2010 includes costs associated with targeted workforce reductions and asset write-offs, that were part of a corporation-wide initiative to improve productivity. The asset write-offs related to two factory closures and the exit of a formula business in the U.K.