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Fair Value Measurements - Estimated Fair Values of Convertible Notes (Detail) - USD ($) $ in Millions | Sep. 24, 2016 | Sep. 26, 2015
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Estimated Fair Value Of Financial Instruments [Line Items] |  |
Estimated fair values of debt instruments | $ 960.9 | $ 1,424.1
2010 Notes [Member] |  |
Estimated Fair Value Of Financial Instruments [Line Items] |  |
Estimated fair values of debt instruments | 20.2 | 264.1
2012 Notes [Member] |  |
Estimated Fair Value Of Financial Instruments [Line Items] |  |
Estimated fair values of debt instruments | 481.9 | 688.2
2013 Notes [Member] |  |
Estimated Fair Value Of Financial Instruments [Line Items] |  |
Estimated fair values of debt instruments | $ 458.8 | $ 471.8

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- Definition Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Convertible Security -URI http://asc.fasb.org/extlink&oid=6509036 + Details
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