Summary of Significant Accounting Policies - Supplemental Cash Flow Statement Information (Detail) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2017	Sep. 24, 2016	Sep. 26, 2015
Accounting Policies [Abstract]
Cash paid during the period for income taxes	$ 867.8	$ 184.8	$ 168.7
Cash paid during the period for interest	$ 102.4	$ 104.0	$ 143.0

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585

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