Goodwill And Intangible Assets (Schedule Of Goodwill Activity By Reportable Segment) (Details) $ in Thousands	3 Months Ended
	Jan. 28, 2017 USD ($)
Goodwill [Line Items]
Goodwill, Purchase Accounting Adjustments	$ 4,979	[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	2,419,419
Accumulated impairment losses, Ending Balance	(129,214)
Goodwill, Net, Ending Balance	2,290,205
Storage Area Networking (“SAN”) Products
Goodwill [Line Items]
Goodwill, Purchase Accounting Adjustments	0
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	69,637
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	1,768,278
Accumulated impairment losses, Ending Balance	(129,214)
Goodwill, Net, Ending Balance	1,639,064
Global Services
Goodwill [Line Items]
Goodwill, Purchase Accounting Adjustments	(74,616)
Goodwill
Goodwill, Gross, Beginning Balance	549,437
Accumulated impairment losses, Beginning Balance	0
Goodwill, Net, Beginning Balance	549,437
Goodwill, Gross, Ending Balance	474,821
Accumulated impairment losses, Ending Balance	0
Goodwill, Net, Ending Balance	$ 474,821

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