Acquisitions, Divestitures, AHS (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands		3 Months Ended		6 Months Ended	9 Months Ended
		Jul. 29, 2017	Jul. 30, 2016	Apr. 29, 2017	Jul. 29, 2017	Jul. 30, 2016	Oct. 29, 2016	May 27, 2016
Business Acquisition [Line Items]
Common stock, shares outstanding		413,745			413,745		401,748
Payments of Merger Related Costs, Financing Activities					$ 41,280,000	$ 0
Gain (Loss) Related to Litigation Settlement		$ (8,528,000)	$ 0		(8,528,000)	0
Goodwill		2,255,326,000			2,255,326,000		$ 2,295,184,000
Goodwill, Purchase Accounting Adjustments	[1]				(3,938,000)
Loss on sold and held for sale software product lines		24,315,000	$ 0		24,315,000	$ 0
IP Networking Products
Business Acquisition [Line Items]
Goodwill		1,603,689,000			1,603,689,000		1,569,427,000
Goodwill, Purchase Accounting Adjustments	[1]				70,182,000
Global Services
Business Acquisition [Line Items]
Goodwill		475,317,000			475,317,000		$ 549,437,000
Goodwill, Purchase Accounting Adjustments	[1]				(74,120,000)
Ruckus
Business Acquisition [Line Items]
Common stock, shares outstanding								92,200
Share Price								$ 8.60
Total purchase consideration (b)					1,275,060,000
Goodwill								$ 669,810,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount								0
Goodwill, Purchase Accounting Adjustments		0		$ 3,900,000
Ruckus | IP Networking Products
Business Acquisition [Line Items]
Goodwill								350,200,000
Ruckus | Global Services
Business Acquisition [Line Items]
Goodwill								$ 319,600,000
Ruckus | Shares Dissented [Member]
Business Acquisition [Line Items]
Common stock, shares outstanding								3,200
Litigation Settlement, Amount		$ 51,900,000
Settlement Amount Per Share		$ 16.22
Payments of Merger Related Costs, Financing Activities		$ 41,280,000
Interest Expense, Other		2,100,000
Gain (Loss) Related to Litigation Settlement		8,500,000
vRouter [Member] | Disposal Group, Disposed of by Sale [Member]
Business Acquisition [Line Items]
Disposal Group, Consideration		31,700,000			31,700,000
Loss on sold and held for sale software product lines		(6,700,000)
HFS, vADC and vEPC [Member] | Disposal Group, Held-for-sale [Member]
Business Acquisition [Line Items]
Loss on sold and held for sale software product lines		(17,600,000)
vADC [Member] | Disposal Group, Held-for-sale [Member]
Business Acquisition [Line Items]
Disposal Group, Consideration		16,000,000			16,000,000
vEPC [Member] | Disposal Group, Held-for-sale [Member]
Business Acquisition [Line Items]
Disposal Group, Consideration		$ 1,900,000			$ 1,900,000

[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.