Acquisitions (Narrative) (Details) $ / shares in Units, shares in Thousands	3 Months Ended			9 Months Ended
	Jul. 30, 2016 USD ($) employess shares	Aug. 01, 2015 USD ($)	May 02, 2015 USD ($)	Jul. 30, 2016 USD ($) shares	Aug. 01, 2015 USD ($)	May 27, 2016 USD ($) $ / shares shares	Oct. 31, 2015 USD ($) shares
Business Acquisition [Line Items]
Common stock, shares outstanding | shares	400,679			400,679			413,923
Acquisition and integration costs	$ 14,868,000	$ 789,000		$ 20,625,000	$ 3,133,000
Goodwill	2,324,315,000			2,324,315,000			$ 1,617,161,000
IP Networking Products
Business Acquisition [Line Items]
Goodwill	1,593,643,000			1,593,643,000			1,285,420,000
Global Services
Business Acquisition [Line Items]
Goodwill	554,352,000			554,352,000			$ 155,416,000
Ruckus
Business Acquisition [Line Items]
Cash Per Share in Acquisition | $ / shares						$ 6.45
Common Stock Per Share in Acquisition						0.75
Common stock, shares outstanding | shares						92,200
Share Price | $ / shares						$ 8.60
Total preliminary purchase consideration (b)	1,275,448,000
Payments to Acquire Businesses, Gross	574,000,000
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	574,000,000
Business Combination, Consideration Transferred, Liabilities Incurred	41,700,000
Business Combination, Integration Related Costs	4,636,000			5,407,000
Goodwill						$ 702,776,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount						0
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual	77,802,000			77,802,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual	(37,611,000)			(37,611,000)
Pro forma net income (loss)	$ (21,936,000)	85,843,000		$ 100,982,000	168,212,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Reasons				Additional information that existed as of the Acquisition Date may become known to the Company during the remainder of the measurement period.
Business Combination, Provisional Information, Initial Accounting Incomplete, Items				The total preliminary purchase consideration and allocation reflects the Company’s preliminary estimates and is subject to revision as additional information in relation to the preliminary purchase consideration and the fair value of the underlying assets acquired and liabilities assumed becomes available.
Ruckus | With Immediate Acceleration [Member]
Business Acquisition [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Number of Employees Affected | employess	8
Ruckus | Without Immediate Acceleration [Member]
Business Acquisition [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Number of Employees Affected | employess	4
Ruckus | Immediate Acceleration of Vested Options [Member]
Business Acquisition [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost	$ 4,679,000			$ 4,679,000
Ruckus | Other Post-Combination Expense [Member]
Business Acquisition [Line Items]
Separately Recognized Transaction, Unamortized Stock Compensation Expense	28,600,000			28,600,000
Ruckus | Acquisition Costs [Member]
Business Acquisition [Line Items]
Acquisition and integration costs	10,232,000			$ 15,219,000
Ruckus | IP Networking Products
Business Acquisition [Line Items]
Goodwill						303,800,000
Ruckus | Global Services
Business Acquisition [Line Items]
Goodwill						$ 398,900,000
Ruckus | Vested Options [Member]
Business Acquisition [Line Items]
Other Consideration Transferred	78,300,000
Ruckus | Replacement Awards [Member]
Business Acquisition [Line Items]
Other Consideration Transferred	7,400,000
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Total preliminary purchase consideration (b)			$ 96,100,000
Cash Acquired from Acquisition			100,000
Payments to Acquire Businesses, Gross			95,500,000
Other Consideration Transferred			$ 500,000
Business Combination, Integration Related Costs		800,000			1,700,000
Series of Individually Immaterial Business Acquisitions [Member] | Acquisition Costs [Member]
Business Acquisition [Line Items]
Acquisition and integration costs					1,469,000
Series of Individually Immaterial Business Acquisitions [Member] | RSU Grant
Business Acquisition [Line Items]
Business Combination, Separately Recognized Transactions, Accounting Method				The RSUs are accounted for as stock-based compensation expense
Separately Recognized Transaction, Expense Recognized	500,000	900,000		$ 1,400,000	1,100,000
Series of Individually Immaterial Business Acquisitions [Member] | Cash Retention Award
Business Acquisition [Line Items]
Business Combination, Separately Recognized Transactions, Accounting Method				The cash awards are accounted for as employee compensation expense
Separately Recognized Transaction, Expense Recognized	$ 900,000	$ 1,600,000		$ 3,400,000	2,000,000
Shares Dissented [Member] | Ruckus
Business Acquisition [Line Items]
Common stock, shares outstanding | shares						3,200
Fair Value Adjustment to Inventory [Member]
Business Acquisition [Line Items]
Pro forma net income (loss)					39,812,000
Acquisition-related Costs [Member]
Business Acquisition [Line Items]
Pro forma net income (loss)					$ 20,625,000