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Income Taxes - Activity of Company's Unrecognized Income Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Balance at beginning of fiscal year	$ 90.3	$ 163.6
Tax positions related to current year:
Additions	9.0	21.8
Reductions	0.0	0.0
Tax positions related to prior years:
Additions related to change in estimate	6.6	1.1
Reductions	(15.4)	(77.3)
Payments	0.0	(1.6)
Lapses in statutes of limitations	(1.4)	(19.9)
Acquired tax positions:
Additions related to reserves acquired from acquisitions	0.4	2.6
Balance as of the end of the fiscal year	$ 89.5	$ 90.3

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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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