Acquisitions and Divestitures Acquisitions (Narrative) (Details) - USD ($)	3 Months Ended			12 Months Ended
	May. 02, 2015	Nov. 01, 2014	Jan. 26, 2013	Oct. 31, 2015	Nov. 01, 2014	[1]
Business Acquisition
Finite-Lived Intangible Asset, Useful Life				6 years 6 months 18 days	4 years 1 month 6 days
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition
Effective Date of Acquisition	Mar. 01, 2015
Total purchase price	$ 96,100,000
Cash consideration	95,500,000
Cash Acquired from Acquisition	100,000
Other consideration transferred	$ 500,000
Equity Interest in Acquiree, Fair Value				$ 400,000
Equity Interest in Acquiree, Valuation Techniques				The Company used a market approach based on comparable recent investments in this acquired business to estimate the acquisition-date fair value of the existing equity interest
Equity Interest in Acquiree, Remeasurement Gain (Loss), Net				$ 0
Vistapointe
Business Acquisition
Effective Date of Acquisition				Sep. 11, 2014
Total purchase price		$ 16,900,000
Cash consideration		16,900,000
Acquisition Cost Expensed		$ 400,000
Vyatta
Business Acquisition
Effective Date of Acquisition				Nov. 09, 2012
Total purchase price			$ 44,800,000
Cash consideration			43,600,000
Other consideration transferred			1,200,000
Acquisition Cost Expensed			$ 400,000
Acquisition-related Costs [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition
Acquisition Cost Expensed				$ 1,400,000
Integration Related Costs				$ 2,500,000
Separately Recognized Transactions, Acquisition Cost Expensed, Financial Statement Caption				Acquisition and integration costs.
Restricted stock units | Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition
Separately Recognized Transaction, Aggregate Fair Value				$ 6,400,000
Separately Recognized Transaction, Tranche Vesting Period				6 months
Separately Recognized Transaction, Total Vesting Period				2 years
Separately Recognized Transactions, Accounting Method				The RSUs are accounted for as stock-based compensation expense
Separately Recognized Transactions, Expenses and Losses, Financial Statement Caption				“Cost of revenues,” “Research and development,” “Sales and marketing,” and “General and administrative”
Separately Recognized Transactions, Expenses and Losses Recognized				$ 1,600,000
Deferred Bonus [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition
Separately Recognized Transaction, Aggregate Fair Value				$ 10,300,000
Separately Recognized Transaction, Total Vesting Period				4 years
Separately Recognized Transactions, Accounting Method				The cash awards are accounted for as employee compensation expense
Separately Recognized Transactions, Expenses and Losses, Financial Statement Caption				“Research and development”
Separately Recognized Transactions, Expenses and Losses Recognized				$ 4,800,000

[1] During the fiscal year ended November 1, 2014, $477.3 million of finite-lived intangible assets became fully amortized and, therefore, were removed from the balance sheet.