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Borrowings and Credit Arrangements - Convertible Notes and Related Equity Components (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 24, 2016	Jul. 01, 2017
Schedule Of Borrowings [Line Items]
Notes principal amount			$ 100.0
Two Thousand And Ten Notes [Member]
Schedule Of Borrowings [Line Items]
Notes principal amount	$ 0.0	$ 12.3
Unamortized discount and issuance costs	0.0	(0.1)
Net carrying amount	0.0	12.2
Equity component, net of taxes	0.0	1.6
Two Thousand And Twelve Notes [Member]
Schedule Of Borrowings [Line Items]
Notes principal amount	245.4	363.4
Unamortized discount and issuance costs	(1.9)	(9.5)
Net carrying amount	243.5	353.9
Equity component, net of taxes	24.1	35.8
Two Thousand And Thirteen Notes [Member]
Schedule Of Borrowings [Line Items]
Notes principal amount	202.0	370.0
Unamortized discount and issuance costs	(1.8)	(17.5)
Net carrying amount	241.0	409.6
Equity component, net of taxes	71.8	131.5
Principal accretion	$ 40.8	$ 57.1

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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Schedule Of Borrowings [Line Items]

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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
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
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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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Amount, after accumulated amortization, of debt discount.

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