Cash, Cash Equivalents and Investments (Narrative) (Details) - USD ($)	12 Months Ended
Oct. 29, 2017	Oct. 30, 2016	Oct. 25, 2015
Fixed income marketable securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Impairments of investments	$ 0	$ 0	$ 0
Equity investments in privately-held companies
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Impairments of investments	$ 10,000,000	$ 8,000,000	$ 9,000,000

The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 35
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=82895926&loc=d3e25351-111560

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