Goodwill And Intangible Assets (Schedule Of Goodwill Activity By Reportable Segment) (Details) (USD $)	3 Months Ended
	Jan. 31, 2015		May 03, 2014
Goodwill
Goodwill, Gross, Beginning Balance	$ 1,696,937,000
Accumulated impairment losses, Beginning Balance	(129,214,000)
Goodwill, Net, Beginning Balance	1,567,723,000
Goodwill, Tax and other adjustments	(5,000)	[1]
Goodwill, Gross, Ending Balance	1,696,932,000
Accumulated impairment losses, Ending Balance	(129,214,000)
Goodwill, Net, Ending Balance	1,567,718,000
SAN Products
Goodwill
Goodwill, Gross, Beginning Balance	176,346,000
Accumulated impairment losses, Beginning Balance	0
Goodwill, Net, Beginning Balance	176,346,000
Goodwill, Tax and other adjustments	(5,000)	[1]
Goodwill, Gross, Ending Balance	176,341,000
Accumulated impairment losses, Ending Balance	0
Goodwill, Net, Ending Balance	176,341,000
Internet Protocol (“IP”) Networking Products
Goodwill
Goodwill, Gross, Beginning Balance	1,365,175,000
Accumulated impairment losses, Beginning Balance	(129,214,000)
Goodwill, Net, Beginning Balance	1,235,961,000
Goodwill, Impairment Loss			(83,400,000)
Goodwill, Tax and other adjustments	0	[1]
Goodwill, Gross, Ending Balance	1,365,175,000
Accumulated impairment losses, Ending Balance	(129,214,000)
Goodwill, Net, Ending Balance	1,235,961,000
Global Services
Goodwill
Goodwill, Gross, Beginning Balance	155,416,000
Accumulated impairment losses, Beginning Balance	0
Goodwill, Net, Beginning Balance	155,416,000
Goodwill, Tax and other adjustments	0	[1]
Goodwill, Gross, Ending Balance	155,416,000
Accumulated impairment losses, Ending Balance	0
Goodwill, Net, Ending Balance	$ 155,416,000

[1] The goodwill adjustments during the three months ended January 31, 2015, were primarily a result of tax benefits from the exercise of stock awards of acquired companies.