Goodwill And Intangible Assets (Schedule Of Company's Intangible Assets) (Details) (USD $)	3 Months Ended		12 Months Ended
	Jan. 25, 2014		Oct. 26, 2013
Finite-Lived Intangible Assets
Gross Carrying Value	$ 3,390,000	[1]	$ 480,700,000
Accumulated Amortization	1,067,000	[1]	462,032,000
Net Carrying Value	2,323,000	[1]	18,668,000
Weighted- Average Remaining Useful Life (in years)	2 years 10 months 2 days		0 years 6 months 29 days
Cost of Fully Amortized Intangible Assets	477,300,000
Trade name
Finite-Lived Intangible Assets
Gross Carrying Value	460,000		460,000
Accumulated Amortization	138,000		110,000
Net Carrying Value	322,000		350,000
Weighted- Average Remaining Useful Life (in years)	2 years 9 months 4 days		3 years 0 months 4 days
Core/developed technology
Finite-Lived Intangible Assets
Gross Carrying Value	1,040,000		192,340,000
Accumulated Amortization	416,000		185,254,000
Net Carrying Value	624,000		7,086,000
Weighted- Average Remaining Useful Life (in years)	1 year 9 months 4 days		0 years 4 months 6 days
Customer relationships
Finite-Lived Intangible Assets
Gross Carrying Value	1,080,000		287,090,000
Accumulated Amortization	268,000		276,473,000
Net Carrying Value	812,000		10,617,000
Weighted- Average Remaining Useful Life (in years)	3 years 9 months 4 days		0 years 6 months 4 days
Non-compete agreements
Finite-Lived Intangible Assets
Gross Carrying Value	810,000		810,000
Accumulated Amortization	245,000		195,000
Net Carrying Value	$ 565,000		$ 615,000
Weighted- Average Remaining Useful Life (in years)	2 years 9 months 4 days		3 years 0 months 4 days

[1] During the three months ended January 25, 2014, $477.3 million of intangible assets became fully amortized and, therefore, were removed from the balance sheet.