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Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | Mar. 29, 2020 | Sep. 29, 2019
--- | --- | ---
Assets: |  |
Total short-term investments | $ 52.9 | $ 70.5
Total Assets | 2,980.9 | 3,016.0
Liabilities: |  |
Financial Liabilities Fair Value Disclosure | 95.8 | 18.2
Cash and Cash Equivalents [Member] |  |
Assets: |  |
Cash and cash equivalents | 2,572.3 | 2,686.6
Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 3.1 | 4.0
Equity Securities, FV-NI | 49.8 | 66.5
Total short-term investments | 52.9 | 70.5
Prepaid Expenses and Other Current Assets [Member] |  |
Assets: |  |
Derivative assets, current | 30.1 | 12.6
Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 198.8 | 220.0
Other Long-Term Assets [Member] |  |
Assets: |  |
Derivative assets, Noncurrent | 126.8 | 26.3
Accrued Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities, Current | 22.3 | 5.7
Other Long-Term Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities, Noncurrent | 73.5 | 12.5
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets: |  |
Total Assets | 2,725.1 | 2,859.6
Liabilities: |  |
Financial Liabilities Fair Value Disclosure | 7.8 | 1.1
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Cash and Cash Equivalents [Member] |  |
Assets: |  |
Cash and cash equivalents | 2,572.3 | 2,686.6
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Equity Securities, FV-NI | 49.8 | 66.5
Total short-term investments | 49.8 | 66.5
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Prepaid Expenses and Other Current Assets [Member] |  |
Assets: |  |
Derivative assets, current | 1.5 | 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 101.5 | 106.5
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other Long-Term Assets [Member] |  |
Assets: |  |
Derivative assets, Noncurrent | 0.0 | 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Accrued Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities, Current | 7.7 | 1.1
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other Long-Term Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities, Noncurrent | 0.1 | 0.0
Significant Other Observable Inputs (Level 2) [Member] |  |
Assets: |  |
Total Assets | 250.1 | 150.6
Liabilities: |  |
Financial Liabilities Fair Value Disclosure | 88.0 | 17.1
Significant Other Observable Inputs (Level 2) [Member] | Cash and Cash Equivalents [Member] |  |
Assets: |  |
Cash and cash equivalents | 0.0 | 0.0
Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 3.1 | 4.0
Equity Securities, FV-NI | 0.0 | 0.0
Total short-term investments | 3.1 | 4.0
Significant Other Observable Inputs (Level 2) [Member] | Prepaid Expenses and Other Current Assets [Member] |  |
Assets: |  |
Derivative assets, current | 28.6 | 12.6
Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 91.6 | 107.7
Significant Other Observable Inputs (Level 2) [Member] | Other Long-Term Assets [Member] |  |
Assets: |  |
Derivative assets, Noncurrent | 126.8 | 26.3
Significant Other Observable Inputs (Level 2) [Member] | Accrued Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities, Current | 14.6 | 4.6
Significant Other Observable Inputs (Level 2) [Member] | Other Long-Term Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities, Noncurrent | 73.4 | 12.5
Significant Unobservable Inputs (Level 3) [Member] |  |
Assets: |  |
Total Assets | 5.7 | 5.8
Liabilities: |  |
Financial Liabilities Fair Value Disclosure | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Cash and Cash Equivalents [Member] |  |
Assets: |  |
Cash and cash equivalents | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Equity Securities, FV-NI | 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: |  |
Derivative assets, current | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 5.7 | 5.8
Significant Unobservable Inputs (Level 3) [Member] | Other Long-Term Assets [Member] |  |
Assets: |  |
Derivative assets, Noncurrent | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Accrued Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities, Current | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Other Long-Term Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities, Noncurrent | 0.0 | 0.0
Commercial Paper [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale |  | 0.5
Commercial Paper [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale |  | 0.0
Commercial Paper [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale |  | 0.5
Commercial Paper [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale |  | 0.0
Corporate Debt Securities [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 3.1 | 3.5
Corporate Debt Securities [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 87.7 | 101.2
Corporate Debt Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Corporate Debt Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Corporate Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 3.1 | 3.5
Corporate Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 87.7 | 101.2
Corporate Debt Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Corporate Debt Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
U.S. Government Treasury Securities [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 101.5 | 106.5
U.S. Government Treasury Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 101.5 | 106.5
U.S. Government Treasury Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
U.S. Government Treasury Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
State and Local Government Obligations [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 3.6 | 4.9
State and Local Government Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
State and Local Government Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 3.6 | 4.9
State and Local Government Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Auction Rate Securities [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 5.7 | 5.8
Auction Rate Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Auction Rate Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Auction Rate Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 5.7 | 5.8
Mortgage and Other Asset-backed Securities [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.3 | 1.6
Mortgage and Other Asset-backed Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Mortgage and Other Asset-backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 0.3 | 1.6
Mortgage and Other Asset-backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | $ 0.0 | $ 0.0

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