Segment Information (Schedule Of Financial Information By Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 27, 2013	Apr. 28, 2012	Apr. 27, 2013	Apr. 28, 2012
Segment Reporting Information
Net revenues	$ 538,784	$ 543,439	$ 1,127,513	$ 1,104,081
Cost of revenues	204,672	206,357	419,476	422,230
Gross margin	334,112	337,082	708,037	681,851
SAN Products
Segment Reporting Information
Net revenues	319,088	342,922	680,822	695,794
Cost of revenues	87,897	90,357	184,850	186,195
Gross margin	231,191	252,565	495,972	509,599
IP Networking Products
Segment Reporting Information
Net revenues	132,658	113,182	273,171	236,612
Cost of revenues	76,702	73,820	154,124	153,389
Gross margin	55,956	39,362	119,047	83,223
Global Services
Segment Reporting Information
Net revenues	87,038	87,335	173,520	171,675
Cost of revenues	40,073	42,180	80,502	82,646
Gross margin	$ 46,965	$ 45,155	$ 93,018	$ 89,029