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Borrowings and Credit Arrangements - Convertible Notes and Related Equity Components (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 24, 2016 | Sep. 26, 2015
Two Thousand And Ten Notes [Member] |  |
Schedule Of Borrowings [Line Items] |  |
Debt Instrument, Face Amount | $ 12.3 | $ 150.0
Unamortized discount and issuance costs (1) | (0.1) | (8.2)
Convertible Notes Payable | 12.2 | 141.8
Debt Instrument, Convertible, Carrying Amount of Equity Component | 1.6 | 20.0
Two Thousand And Twelve Notes [Member] |  |
Schedule Of Borrowings [Line Items] |  |
Debt Instrument, Face Amount | 363.4 | 500.0
Unamortized discount and issuance costs (1) | (9.5) | (21.8)
Convertible Notes Payable | 353.9 | 478.2
Debt Instrument, Convertible, Carrying Amount of Equity Component | 35.8 | 49.2
Two Thousand And Thirteen Notes [Member] |  |
Schedule Of Borrowings [Line Items] |  |
Debt Instrument, Face Amount | 370.0 | 370.0
Unamortized discount and issuance costs (1) | (17.5) | (29.9)
Convertible Notes Payable | 409.6 | 380.6
Debt Instrument, Convertible, Carrying Amount of Equity Component | 131.5 | 131.5
Base Principal Amount For Accretion Value | $ 57.1 | $ 40.5

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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- Definition The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031897-161870 + Details
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