Segment Information (Schedule Of Financial Information By Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Jan. 31, 2015	Jan. 25, 2014
Segment Reporting Information
Net revenues	$ 576,239us-gaap_SalesRevenueNet	$ 564,535us-gaap_SalesRevenueNet
Cost of revenues	186,556us-gaap_CostOfRevenue	191,865us-gaap_CostOfRevenue
Gross margin	389,683us-gaap_GrossProfit	372,670us-gaap_GrossProfit
SAN Products
Segment Reporting Information
Net revenues	353,399	355,456
Cost of revenues	85,725	92,941
Gross margin	267,674	262,515
Internet Protocol (“IP”) Networking Products
Segment Reporting Information
Net revenues	132,839	119,749
Cost of revenues	64,201	60,686
Gross margin	68,638	59,063
Global Services
Segment Reporting Information
Net revenues	90,001	89,330
Cost of revenues	36,630	38,238
Gross margin	$ 53,371	$ 51,092

The aggregate cost of goods produced and sold and services rendered during the reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 2

-Article 5

+ Details

Name:	us-gaap_CostOfRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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- Details

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- Details

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- Details

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- Details

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