Goodwill And Intangible Assets (Schedule Of Goodwill Activity By Reportable Segment) (Details) $ in Thousands	6 Months Ended
	Apr. 29, 2017 USD ($)
Goodwill [Line Items]
Goodwill, Purchase Accounting Adjustments	$ (3,938)	[1]
Goodwill
Goodwill, Gross, Beginning Balance	2,424,398
Accumulated impairment losses, Beginning Balance	(129,214)
Goodwill, Net, Beginning Balance	2,295,184
Goodwill, Gross, Ending Balance	2,420,460
Accumulated impairment losses, Ending Balance	(129,214)
Goodwill, Net, Ending Balance	2,291,246
Storage Area Networking (“SAN”) Products
Goodwill [Line Items]
Goodwill, Purchase Accounting Adjustments	0	[1]
Goodwill
Goodwill, Gross, Beginning Balance	176,320
Accumulated impairment losses, Beginning Balance	0
Goodwill, Net, Beginning Balance	176,320
Goodwill, Gross, Ending Balance	176,320
Accumulated impairment losses, Ending Balance	0
Goodwill, Net, Ending Balance	176,320
IP Networking Products
Goodwill [Line Items]
Goodwill, Purchase Accounting Adjustments	70,182	[1]
Goodwill
Goodwill, Gross, Beginning Balance	1,698,641
Accumulated impairment losses, Beginning Balance	(129,214)
Goodwill, Net, Beginning Balance	1,569,427
Goodwill, Gross, Ending Balance	1,768,823
Accumulated impairment losses, Ending Balance	(129,214)
Goodwill, Net, Ending Balance	1,639,609
Global Services
Goodwill [Line Items]
Goodwill, Purchase Accounting Adjustments	(74,120)	[1]
Goodwill
Goodwill, Gross, Beginning Balance	549,437
Accumulated impairment losses, Beginning Balance	0
Goodwill, Net, Beginning Balance	549,437
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,” of the Notes to Condensed Consolidated Financial Statements.