Goodwill And Intangible Assets (Schedule Of Goodwill Activity By Reportable Segment) (Details) $ in Thousands	9 Months Ended
	Jul. 29, 2017 USD ($)
Goodwill
Goodwill, Gross, Beginning Balance	$ 2,424,398
Accumulated impairment losses, Beginning Balance	(129,214)
Goodwill, Net, Beginning Balance	2,295,184
Goodwill, Purchase Accounting Adjustments	(3,938)	[1]
Goodwill, Reduction Due to Divestitures	35,920	[2]
Goodwill, Gross, Ending Balance	2,384,540
Accumulated impairment losses, Ending Balance	(129,214)
Goodwill, Net, Ending Balance	2,255,326
Storage Area Networking (“SAN”) Products
Goodwill
Goodwill, Gross, Beginning Balance	176,320
Accumulated impairment losses, Beginning Balance	0
Goodwill, Net, Beginning Balance	176,320
Goodwill, Purchase Accounting Adjustments	0	[1]
Goodwill, Reduction Due to Divestitures	0
Goodwill, Gross, Ending Balance	176,320
Accumulated impairment losses, Ending Balance	0
Goodwill, Net, Ending Balance	176,320
IP Networking Products
Goodwill
Goodwill, Gross, Beginning Balance	1,698,641
Accumulated impairment losses, Beginning Balance	(129,214)
Goodwill, Net, Beginning Balance	1,569,427
Goodwill, Purchase Accounting Adjustments	70,182	[1]
Goodwill, Reduction Due to Divestitures	35,920	[2]
Goodwill, Gross, Ending Balance	1,732,903
Accumulated impairment losses, Ending Balance	(129,214)
Goodwill, Net, Ending Balance	1,603,689
Global Services
Goodwill
Goodwill, Gross, Beginning Balance	549,437
Accumulated impairment losses, Beginning Balance	0
Goodwill, Net, Beginning Balance	549,437
Goodwill, Purchase Accounting Adjustments	(74,120)	[1]
Goodwill, Reduction Due to Divestitures	0
Goodwill, Gross, Ending Balance	475,317
Accumulated impairment losses, Ending Balance	0
Goodwill, Net, Ending Balance	$ 475,317

[1] For the measurement period adjustments recorded in connection with the acquisition of Ruckus, see Note 3, “Acquisitions, Divestitures, and Assets Held for Sale,” of the Notes to Condensed Consolidated Financial Statements.

[2] The reduction in goodwill relates to the completed divestiture of the Company’s vRouter product line and the pending divestitures of the vADC and vEPC product lines in the third quarter of fiscal year 2017. See Note 3, “Acquisitions, Divestitures, and Assets Held for Sale,” of the Notes to Condensed Consolidated Financial Statements for additional information.