Equity - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions	12 Months Ended
Oct. 01, 2016	Oct. 03, 2015	Jan. 30, 2015
Equity [Abstract]
Total shares authorized for repurchase			400
Remaining shares authorized for repurchase	282
Available-for-sale securities, unrecognized gain positions	$ 49	$ 21

Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

Name:	us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration