Goodwill and Intangible Assets, Net - Reconciliation of Goodwill (Detail) - USD ($) $ in Millions	12 Months Ended
Sep. 27, 2015	Sep. 28, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Beginning balance	$ 885.6	$ 790.2
Additions from acquisitions	253.7	95.4
Ending balance	$ 1,139.3	$ 885.6

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant