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Income Taxes - Activity of Company's Unrecognized Income Tax Benefits (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 27, 2014	Sep. 28, 2013
Income Tax Disclosure [Abstract]
Balance at beginning of fiscal year	$ 121.8	$ 53.1
Tax positions related to current year:
Additions	10.8	65.0
Reductions	0	0
Tax positions related to prior years:
Additions related to change in estimate	10.9	3.3
Reductions	(2.7)	(0.4)
Payments	0	(0.6)
Lapses in statutes of limitations and settlements	(3.8)	(2.3)
Acquired tax positions:
Additions related to reserves acquired from acquisitions	0	3.7
Balance as of the end of the fiscal year	$ 137.0	$ 121.8

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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