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Summary of Significant Accounting Policies - Summary of Marketable Securities (Detail) (USD $) In Millions, unless otherwise specified	Sep. 27, 2014	Sep. 28, 2013	Sep. 29, 2012
Schedule Of Marketable Securities [Line Items]
Marketable securities	$ 24.4	$ 18.1
Equity Securities [Member]
Schedule Of Marketable Securities [Line Items]
Cost	15.5	5.9	5.9
Gross Unrealized Gains	10.2	12.2	0.1
Gross Unrealized Losses	(1.3)	0	0
Fair Value			$ 6.0

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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