Basis Of Presentation (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended			24 Months Ended
	Apr. 30, 2011	Oct. 29, 2011	Oct. 30, 2010	Oct. 31, 2009	Oct. 25, 2008
Basis Of Presentation [Abstract]
Cumulative amount of immaterial errors		$ 17.1
Change in net revenues	(1.8)		(3.2)	(2.6)	(9.5)
Decrease in total assets due to immaterial error revisions			8.2
Decrease in stockholders' equity due to immaterial error revisions			10.9
Increase in liabilities due to immaterial error revisions			2.7
Change in net income			$ (2.3)	$ (1.8)