Segment Information (Schedule Of Financial Information By Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 01, 2015	Aug. 02, 2014	Aug. 01, 2015	Aug. 02, 2014
Segment Reporting Information
Net revenues	$ 551,819	$ 545,464	$ 1,674,633	$ 1,646,909
Cost of revenues	179,915	183,751	540,837	558,234
Gross margin	371,904	361,713	1,133,796	1,088,675
SAN Products
Segment Reporting Information
Net revenues	309,451	325,238	976,362	1,001,858
Cost of revenues	73,657	83,938	233,150	261,393
Gross margin	235,794	241,300	743,212	740,465
Internet Protocol (“IP”) Networking Products
Segment Reporting Information
Net revenues	153,749	132,559	431,319	373,424
Cost of revenues	70,586	61,580	198,631	180,023
Gross margin	83,163	70,979	232,688	193,401
Global Services
Segment Reporting Information
Net revenues	88,619	87,667	266,952	271,627
Cost of revenues	35,672	38,233	109,056	116,818
Gross margin	$ 52,947	$ 49,434	$ 157,896	$ 154,809