Segment Information (Schedule Of Financial Information By Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jul. 27, 2013	Jul. 28, 2012	Jul. 27, 2013	Jul. 28, 2012
Segment Reporting Information
Net revenues	$ 536,551	$ 555,332	$ 1,664,064	$ 1,659,413
Cost of revenues	198,349	214,854	617,825	637,084
Gross margin	338,202	340,478	1,046,239	1,022,329
SAN Products
Segment Reporting Information
Net revenues	314,087	321,464	994,909	1,017,258
Cost of revenues	85,611	87,113	270,461	273,308
Gross margin	228,476	234,351	724,448	743,950
IP Networking Products
Segment Reporting Information
Net revenues	133,906	145,817	407,077	382,429
Cost of revenues	74,830	86,524	228,954	239,913
Gross margin	59,076	59,293	178,123	142,516
Global Services
Segment Reporting Information
Net revenues	88,558	88,051	262,078	259,726
Cost of revenues	37,908	41,217	118,410	123,863
Gross margin	$ 50,650	$ 46,834	$ 143,668	$ 135,863