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Income Taxes - Activity of Company's Unrecognized Income Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 24, 2016
Income Tax Disclosure [Abstract]
Balance at beginning of fiscal year	$ 163.6	$ 154.7
Tax positions related to current year:
Additions	21.8	23.9
Reductions	0.0	0.0
Tax positions related to prior years:
Additions related to change in estimate	1.1	1.1
Reductions	(77.3)	(6.9)
Payments	(1.6)	(6.0)
Lapses in statutes of limitations	(19.9)	(3.2)
Acquired tax positions:
Additions related to reserves acquired from acquisitions	2.6	0.0
Balance as of the end of the fiscal year	$ 90.3	$ 163.6

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Tax positions related to current year.

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Amount of unrecognized tax benefits.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
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-URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319

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