Summary of Significant Accounting Policies - Supplemental Cash Flow Statement Information (Detail) - USD ($) $ in Millions	12 Months Ended
Sep. 26, 2015	Sep. 27, 2014	Sep. 28, 2013
Accounting Policies [Abstract]
Cash paid during the period for income taxes	$ 168.7	$ 231.8	$ 79.9
Cash paid during the period for interest	$ 143.0	$ 155.7	$ 192.8

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=31042434&loc=d3e3536-108585

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