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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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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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