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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions | Sep. 27, 2015 | Sep. 28, 2014
--- | --- | ---
Assets [Abstract] |  |
Total short-term investments | $ 81.3 | $ 135.4
Long-term investments: Available-for-sale securities | 312.5 | 318.4
Total assets | 2,029.4 | 2,208.9
Liabilities [Abstract] |  |
Total liabilities | 33.7 |
Cash and cash equivalents [Member] |  |
Assets [Abstract] |  |
Cash and cash equivalents | 1,530.1 | 1,708.4
Short-term investments [Member] |  |
Assets [Abstract] |  |
Short-term investments: Available-for-sale securities | 15.5 | 63.2
Short-term investments: Trading securities | 65.8 | 72.2
Total short-term investments | 81.3 | 135.4
Prepaid expenses and other current assets [Member] |  |
Assets [Abstract] |  |
Prepaid expenses and other current assets: Derivative assets | 50.8 | 28.7
Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 312.5 | 318.4
Other long-term assets [Member] |  |
Assets [Abstract] |  |
Other long-term assets: Derivative assets | 54.7 | 18.0
Accrued liabilities [Member] |  |
Liabilities [Abstract] |  |
Accrued liabilities: Derivative liabilities | 19.2 | 2.4
Other long-term liabilities [Member] |  |
Liabilities [Abstract] |  |
Other long-term liabilities: Derivative liabilities | 14.5 |
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] |  |
Assets [Abstract] |  |
Total assets | 1,700.7 | 1,887.2
Liabilities [Abstract] |  |
Total liabilities | 3.6 |
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Cash and cash equivalents [Member] |  |
Assets [Abstract] |  |
Cash and cash equivalents | 1,530.1 | 1,708.4
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Short-term investments: Available-for-sale securities | 0.0 | 10.9
Short-term investments: Trading securities | 65.8 | 72.2
Total short-term investments | 65.8 | 83.1
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Prepaid expenses and other current assets [Member] |  |
Assets [Abstract] |  |
Prepaid expenses and other current assets: Derivative assets | 0.0 | 0.9
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 104.8 | 94.8
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Other long-term assets [Member] |  |
Assets [Abstract] |  |
Other long-term assets: Derivative assets | 0.0 | 0.0
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Accrued liabilities [Member] |  |
Liabilities [Abstract] |  |
Accrued liabilities: Derivative liabilities | 3.6 | 0.4
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Other long-term liabilities [Member] |  |
Liabilities [Abstract] |  |
Other long-term liabilities: Derivative liabilities | 0.0 |
Significant Other Observable Inputs (Level 2) [Member] |  |
Assets [Abstract] |  |
Total assets | 322.8 | 307.9
Liabilities [Abstract] |  |
Total liabilities | 30.1 |
Significant Other Observable Inputs (Level 2) [Member] | Cash and cash equivalents [Member] |  |
Assets [Abstract] |  |
Cash and cash equivalents | 0.0 | 0.0
Significant Other Observable Inputs (Level 2) [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Short-term investments: Available-for-sale securities | 15.5 | 52.3
Short-term investments: Trading securities | 0.0 | 0.0
Total short-term investments | 15.5 | 52.3
Significant Other Observable Inputs (Level 2) [Member] | Prepaid expenses and other current assets [Member] |  |
Assets [Abstract] |  |
Prepaid expenses and other current assets: Derivative assets | 50.8 | 27.8
Significant Other Observable Inputs (Level 2) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 201.8 | 209.8
Significant Other Observable Inputs (Level 2) [Member] | Other long-term assets [Member] |  |
Assets [Abstract] |  |
Other long-term assets: Derivative assets | 54.7 | 18.0
Significant Other Observable Inputs (Level 2) [Member] | Accrued liabilities [Member] |  |
Liabilities [Abstract] |  |
Accrued liabilities: Derivative liabilities | 15.6 | 2.0
Significant Other Observable Inputs (Level 2) [Member] | Other long-term liabilities [Member] |  |
Liabilities [Abstract] |  |
Other long-term liabilities: Derivative liabilities | 14.5 |
Significant Unobservable Inputs (Level 3) [Member] |  |
Assets [Abstract] |  |
Total assets | 5.9 | 13.8
Liabilities [Abstract] |  |
Total liabilities | 0.0 |
Significant Unobservable Inputs (Level 3) [Member] | Cash and cash equivalents [Member] |  |
Assets [Abstract] |  |
Cash and cash equivalents | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Short-term investments: Available-for-sale securities | 0.0 | 0.0
Short-term investments: Trading securities | 0.0 | 0.0
Total short-term investments | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Prepaid expenses and other current assets [Member] |  |
Assets [Abstract] |  |
Prepaid expenses and other current assets: Derivative assets | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 5.9 | 13.8
Significant Unobservable Inputs (Level 3) [Member] | Other long-term assets [Member] |  |
Assets [Abstract] |  |
Other long-term assets: Derivative assets | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Accrued liabilities [Member] |  |
Liabilities [Abstract] |  |
Accrued liabilities: Derivative liabilities | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Other long-term liabilities [Member] |  |
Liabilities [Abstract] |  |
Other long-term liabilities: Derivative liabilities | 0.0 |
Agency obligations [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 8.6 | 8.9
Agency obligations [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 0.0 | 0.0
Agency obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 8.6 | 8.9
Agency obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 0.0 | 0.0
Corporate debt securities [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Short-term investments: Available-for-sale securities | 10.2 | 4.9
Corporate debt securities [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 121.8 | 130.9
Corporate debt securities [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Short-term investments: Available-for-sale securities | 0.0 | 0.0
Corporate debt securities [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 0.0 | 0.0
Corporate debt securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Short-term investments: Available-for-sale securities | 10.2 | 4.9
Corporate debt securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 121.8 | 130.9
Corporate debt securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Short-term investments: Available-for-sale securities | 0.0 | 0.0
Corporate debt securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 0.0 | 0.0
Auction rate securities [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 5.9 | 13.8
Auction rate securities [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 0.0 | 0.0
Auction rate securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 0.0 | 0.0
Auction rate securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 5.9 | 13.8
Foreign government obligations [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Short-term investments: Available-for-sale securities | 2.0 | 33.7
Foreign government obligations [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 18.5 | 17.4
Foreign government obligations [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Short-term investments: Available-for-sale securities | 0.0 | 0.0
Foreign government obligations [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 0.0 | 0.0
Foreign government obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Short-term investments: Available-for-sale securities | 2.0 | 33.7
Foreign government obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 18.5 | 17.4
Foreign government obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Short-term investments: Available-for-sale securities | 0.0 | 0.0
Foreign government obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 0.0 | 0.0
U.S. government treasury securities [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Short-term investments: Available-for-sale securities |  | 10.9
U.S. government treasury securities [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 104.8 | 94.8
U.S. government treasury securities [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Short-term investments: Available-for-sale securities |  | 10.9
U.S. government treasury securities [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 104.8 | 94.8
U.S. government treasury securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Short-term investments: Available-for-sale securities |  | 0.0
U.S. government treasury securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 0.0 | 0.0
U.S. government treasury securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Short-term investments: Available-for-sale securities |  | 0.0
U.S. government treasury securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 0.0 | 0.0
State and local government obligations [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Short-term investments: Available-for-sale securities | 3.3 | 12.7
State and local government obligations [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 9.7 | 6.7
State and local government obligations [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Short-term investments: Available-for-sale securities | 0.0 | 0.0
State and local government obligations [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 0.0 | 0.0
State and local government obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Short-term investments: Available-for-sale securities | 3.3 | 12.7
State and local government obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 9.7 | 6.7
State and local government obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Short-term investments: Available-for-sale securities | 0.0 | 0.0
State and local government obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 0.0 | 0.0
Certificates of deposit [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Short-term investments: Available-for-sale securities |  | 1.0
Certificates of deposit [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Short-term investments: Available-for-sale securities |  | 0.0
Certificates of deposit [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Short-term investments: Available-for-sale securities |  | 1.0
Certificates of deposit [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Short-term investments: Available-for-sale securities |  | 0.0
Mortgage and other asset-backed securities [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 43.2 | 45.9
Mortgage and other asset-backed securities [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 0.0 | 0.0
Mortgage and other asset-backed securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | 43.2 | 45.9
Mortgage and other asset-backed securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Long-term investments: Available-for-sale securities | $ 0.0 | $ 0.0

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- Definition Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26626-111562 + Details
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- Definition Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26626-111562 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Assets -URI http://asc.fasb.org/extlink&oid=6509628 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 + Details
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