Segment Information (Schedule Of Financial Information By Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 29, 2017	Jul. 30, 2016	Jul. 29, 2017	Jul. 30, 2016
Segment Reporting Information
Net revenues	$ 549,266	$ 590,721	$ 1,683,482	$ 1,688,311
Cost of revenues	198,121	233,822	622,454	592,286
Gross margin	351,145	356,899	1,061,028	1,096,025
Storage Area Networking (“SAN”) Products
Segment Reporting Information
Net revenues	275,872	282,114	864,401	925,799
Cost of revenues	65,498	70,630	210,445	223,806
Gross margin	210,374	211,484	653,956	701,993
IP Networking Products
Segment Reporting Information
Net revenues	173,677	208,881	520,872	474,556
Cost of revenues	89,262	117,862	275,708	240,991
Gross margin	84,415	91,019	245,164	233,565
Global Services
Segment Reporting Information
Net revenues	99,717	99,726	298,209	287,956
Cost of revenues	43,361	45,330	136,301	127,489
Gross margin	$ 56,356	$ 54,396	$ 161,908	$ 160,467