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Borrowings and Credit Arrangements - Convertible Notes and Related Equity Components (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 26, 2015	Sep. 27, 2014
Two Thousand And Ten Notes [Member]
Schedule Of Borrowings [Line Items]
Debt Instrument, Face Amount	$ 150.0	$ 450.0
Debt Instrument, Unamortized Discount	(7.8)	(41.5)
Convertible Notes Payable	142.2	408.5
Debt Instrument, Convertible, Carrying Amount of Equity Component	20.0	60.1
Two Thousand And Twelve Notes [Member]
Schedule Of Borrowings [Line Items]
Debt Instrument, Face Amount	500.0	500.0
Debt Instrument, Unamortized Discount	(19.7)	(27.3)
Convertible Notes Payable	480.3	472.7
Debt Instrument, Convertible, Carrying Amount of Equity Component	49.2	49.2
Two Thousand And Thirteen Notes [Member]
Schedule Of Borrowings [Line Items]
Debt Instrument, Face Amount	370.0	370.0
Debt Instrument, Unamortized Discount	(29.3)	(40.1)
Convertible Notes Payable	381.2	354.4
Debt Instrument, Convertible, Carrying Amount of Equity Component	131.5	131.5
Base Principal Amount For Accretion Value	$ 40.5	$ 24.5

X

- Definition

Represents the amount of principal accretion at the applicable rate pursuant to the terms of the debt agreement, which is recorded as interest expense.

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



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-Name Accounting Standards Codification



-Topic 942



-SubTopic 210



-Section S99



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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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Face (par) amount of debt instrument at time of issuance.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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