Segment Information (Schedule Of Financial Information By Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 29, 2017	Apr. 30, 2016	Apr. 29, 2017	Apr. 30, 2016
Segment Reporting Information
Net revenues	$ 552,753	$ 523,306	$ 1,134,216	$ 1,097,590
Cost of revenues	209,993	172,995	424,333	358,464
Gross margin	342,760	350,311	709,883	739,126
Storage Area Networking (“SAN”) Products
Segment Reporting Information
Net revenues	281,656	296,627	588,529	643,685
Cost of revenues	69,217	71,972	144,947	153,176
Gross margin	212,439	224,655	443,582	490,509
IP Networking Products
Segment Reporting Information
Net revenues	173,451	131,566	347,195	265,675
Cost of revenues	95,521	60,236	186,446	123,129
Gross margin	77,930	71,330	160,749	142,546
Global Services
Segment Reporting Information
Net revenues	97,646	95,113	198,492	188,230
Cost of revenues	45,255	40,787	92,940	82,159
Gross margin	$ 52,391	$ 54,326	$ 105,552	$ 106,071