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Summary of Significant Accounting Policies - Summary of Marketable Securities (Detail) - USD ($) $ in Millions | Sep. 24, 2016 | Sep. 26, 2015 | Sep. 27, 2014
--- | --- | --- | ---
Schedule Of Marketable Securities [Line Items] |  |  |
Gross Unrealized Gains |  | $ 7.2 |
Other than temporary impairment |  | (7.8) |
Equity Securities [Member] |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |
Cost | $ 2.4 | 16.1 | $ 15.5
Gross Unrealized Gains | 0.0 |  | 10.2
Gross Unrealized Losses | (0.3) | (0.3) | (1.3)
Other than temporary impairment | (1.1) | (7.8) | 0.0
Marketable securities | $ 1.0 | $ 15.2 | $ 24.4

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- Definition Amount of equity securities categorized neither as held-to-maturity nor as 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=51813488&loc=d3e22054-111558 Reference 2: 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=49167202&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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