Segment Information (Schedule Of Financial Information By Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Oct. 26, 2013	Jul. 27, 2013	Apr. 27, 2013	Jan. 26, 2013	Oct. 27, 2012	Jul. 28, 2012	Apr. 28, 2012	Jan. 28, 2012	Oct. 26, 2013	Oct. 27, 2012	Oct. 29, 2011
Segment Reporting Information
Net revenues	$ 558,800	$ 536,551	$ 538,784	$ 588,729	$ 578,357	$ 555,332	$ 543,439	$ 560,642	$ 2,222,864	$ 2,237,770	$ 2,147,442
Cost of revenues									813,985	854,751	863,908
Gross margin	362,640	338,202	334,112	373,925	360,690	340,478	337,082	344,769	1,408,879	1,383,019	1,283,534
SAN Products
Segment Reporting Information
Net revenues									1,318,509	1,356,099	1,237,994
Cost of revenues									355,388	362,608	356,013
Gross margin									963,121	993,491	881,981
IP Networking Products
Segment Reporting Information
Net revenues									552,058	534,757	551,820
Cost of revenues									302,974	327,248	321,183
Gross margin									249,084	207,509	230,637
Global Services
Segment Reporting Information
Net revenues									352,297	346,914	357,628
Cost of revenues									155,623	164,895	186,712
Gross margin									$ 196,674	$ 182,019	$ 170,916