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Fair Value Measurements - Estimated Fair Values of Convertible Notes (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Sep. 24, 2016
Estimated Fair Value Of Financial Instruments [Line Items]
Estimated fair values of debt instruments	$ 541.7	$ 960.9
2010 Notes
Estimated Fair Value Of Financial Instruments [Line Items]
Estimated fair values of debt instruments	0.0	20.2
2012 Notes
Estimated Fair Value Of Financial Instruments [Line Items]
Estimated fair values of debt instruments	297.3	481.9
2013 Notes
Estimated Fair Value Of Financial Instruments [Line Items]
Estimated fair values of debt instruments	$ 244.4	$ 458.8

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- Definition

Estimated Fair Value Of Financial Instruments [Line Items]

+ References

No definition available.

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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

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