Segment Information (Schedule Of Financial Information By Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Oct. 29, 2011	Jul. 30, 2011	Apr. 30, 2011	Jan. 29, 2011	Oct. 30, 2010	Jul. 31, 2010	May 01, 2010	Jan. 30, 2010	Oct. 29, 2011		Oct. 30, 2010		Oct. 31, 2009
Segment Reporting Information [Line Items]
Net revenues	$ 550,472	$ 502,850	$ 548,364	$ 545,756	$ 548,629	$ 504,252	$ 500,613	$ 537,659	$ 2,147,442		$ 2,091,153		$ 1,950,376
Cost of revenues									863,908	[1]	860,033	[1]	919,426	[1]
Gross margin	327,515	306,527	328,609	320,883	323,274	285,421	295,120	327,305	1,283,534		1,231,120		1,030,950
Data Storage Products [Member]
Segment Reporting Information [Line Items]
Net revenues									1,237,994		1,240,626		1,188,527
Cost of revenues									356,013	[1]	394,506	[1]	467,496	[1]
Gross margin									881,981		846,120		721,031
Ethernet Products [Member]
Segment Reporting Information [Line Items]
Net revenues									551,820		488,188		424,434
Cost of revenues									321,183	[1]	288,980	[1]	271,858	[1]
Gross margin									230,637		199,208		152,576
Global Services [Member]
Segment Reporting Information [Line Items]
Net revenues									357,628		362,339		337,415
Cost of revenues									186,712	[1]	176,547	[1]	180,072	[1]
Gross margin									$ 170,916		$ 185,792		$ 157,343

[1] Fiscal years 2011 and 2010 reflect the classification of system engineer costs within sales and marketing expenses as opposed to cost of revenues in prior periods. Fiscal year 2009 has not been updated for the new cost classification implemented in 2010. See Note 1, "Basis of Presentation," of the Notes to Consolidated Financial Statements.