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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions | Oct. 03, 2021 | Sep. 27, 2020
--- | --- | ---
Assets [Abstract] |  |
Total short-term investments | $ 162.2 | $ 281.2
Total assets | 7,131.5 | 4,941.1
Liabilities [Abstract] |  |
Total liabilities | 16.8 | 86.6
Cash and cash equivalents [Member] |  |
Assets [Abstract] |  |
Cash and cash equivalents | 6,455.7 | 4,350.9
Short-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 87.8 | 216.3
Equity Securities, FV-NI | 74.4 | 64.9
Total short-term investments | 162.2 | 281.2
Prepaid Expenses and Other Current Assets [Member] |  |
Assets [Abstract] |  |
Derivative assets, Current | 147.6 | 15.6
Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 281.7 | 206.1
Other long-term assets [Member] |  |
Assets [Abstract] |  |
Derivative assets, Noncurrent | 84.3 | 87.3
Accrued liabilities [Member] |  |
Liabilities [Abstract] |  |
Derivative liabilities, Current | 8.6 | 7.3
Other long-term liabilities [Member] |  |
Liabilities [Abstract] |  |
Derivative liabilities, Noncurrent | 8.2 | 79.3
Commercial Paper [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 63.0 | 66.8
Corporate debt securities [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 24.7 | 123.6
Corporate debt securities [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 162.0 | 82.6
Auction rate securities [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 6.0 | 5.7
Foreign government obligations [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale |  | 8.5
Foreign government obligations [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 4.0 |
U.S. Government Treasury Securities [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 76.3 | 94.9
State and local government obligations [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 1.5 | 3.6
Mortgage and other asset-backed securities [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 0.1 | 15.8
Mortgage and other asset-backed securities [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 31.9 | 19.3
Certificates of Deposit | Short-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale |  | 1.6
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] |  |
Assets [Abstract] |  |
Total assets | 6,737.5 | 4,514.3
Liabilities [Abstract] |  |
Total liabilities | 0.3 | 2.0
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Cash and cash equivalents [Member] |  |
Assets [Abstract] |  |
Cash and cash equivalents | 6,455.7 | 4,350.9
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Equity Securities, FV-NI | 74.4 | 64.9
Total short-term investments | 74.4 | 64.9
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Prepaid Expenses and Other Current Assets [Member] |  |
Assets [Abstract] |  |
Derivative assets, Current | 131.1 | 3.6
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 76.3 | 94.9
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Other long-term assets [Member] |  |
Assets [Abstract] |  |
Derivative assets, Noncurrent | 0.0 | 0.0
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Accrued liabilities [Member] |  |
Liabilities [Abstract] |  |
Derivative liabilities, Current | 0.3 | 1.9
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Other long-term liabilities [Member] |  |
Liabilities [Abstract] |  |
Derivative liabilities, Noncurrent | 0.0 | 0.1
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Commercial Paper [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Corporate debt securities [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Corporate debt securities [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Auction rate securities [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Foreign government obligations [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale |  | 0.0
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Foreign government obligations [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 0.0 |
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | U.S. Government Treasury Securities [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 76.3 | 94.9
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | State and local government obligations [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Mortgage and other asset-backed securities [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Mortgage and other asset-backed securities [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Certificates of Deposit | Short-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale |  | 0.0
Significant Other Observable Inputs (Level 2) [Member] |  |
Assets [Abstract] |  |
Total assets | 388.0 | 421.1
Liabilities [Abstract] |  |
Total liabilities | 16.5 | 84.6
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] |  |
Debt Securities, Available-for-sale | 87.8 | 216.3
Equity Securities, FV-NI | 0.0 | 0.0
Total short-term investments | 87.8 | 216.3
Significant Other Observable Inputs (Level 2) [Member] | Prepaid Expenses and Other Current Assets [Member] |  |
Assets [Abstract] |  |
Derivative assets, Current | 16.5 | 12.0
Significant Other Observable Inputs (Level 2) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 199.4 | 105.5
Significant Other Observable Inputs (Level 2) [Member] | Other long-term assets [Member] |  |
Assets [Abstract] |  |
Derivative assets, Noncurrent | 84.3 | 87.3
Significant Other Observable Inputs (Level 2) [Member] | Accrued liabilities [Member] |  |
Liabilities [Abstract] |  |
Derivative liabilities, Current | 8.3 | 5.4
Significant Other Observable Inputs (Level 2) [Member] | Other long-term liabilities [Member] |  |
Liabilities [Abstract] |  |
Derivative liabilities, Noncurrent | 8.2 | 79.2
Significant Other Observable Inputs (Level 2) [Member] | Commercial Paper [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 63.0 | 66.8
Significant Other Observable Inputs (Level 2) [Member] | Corporate debt securities [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 24.7 | 123.6
Significant Other Observable Inputs (Level 2) [Member] | Corporate debt securities [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 162.0 | 82.6
Significant Other Observable Inputs (Level 2) [Member] | Auction rate securities [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Significant Other Observable Inputs (Level 2) [Member] | Foreign government obligations [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale |  | 8.5
Significant Other Observable Inputs (Level 2) [Member] | Foreign government obligations [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 4.0 |
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government Treasury Securities [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Significant Other Observable Inputs (Level 2) [Member] | State and local government obligations [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 1.5 | 3.6
Significant Other Observable Inputs (Level 2) [Member] | Mortgage and other asset-backed securities [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 0.1 | 15.8
Significant Other Observable Inputs (Level 2) [Member] | Mortgage and other asset-backed securities [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 31.9 | 19.3
Significant Other Observable Inputs (Level 2) [Member] | Certificates of Deposit | Short-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale |  | 1.6
Significant Unobservable Inputs (Level 3) [Member] |  |
Assets [Abstract] |  |
Total assets | 6.0 | 5.7
Liabilities [Abstract] |  |
Total liabilities | 0.0 | 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] |  |
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 [Abstract] |  |
Derivative assets, Current | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 6.0 | 5.7
Significant Unobservable Inputs (Level 3) [Member] | Other long-term assets [Member] |  |
Assets [Abstract] |  |
Derivative assets, Noncurrent | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Accrued liabilities [Member] |  |
Liabilities [Abstract] |  |
Derivative liabilities, Current | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Other long-term liabilities [Member] |  |
Liabilities [Abstract] |  |
Derivative liabilities, Noncurrent | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Commercial Paper [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Corporate debt securities [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Corporate debt securities [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Auction rate securities [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 6.0 | 5.7
Significant Unobservable Inputs (Level 3) [Member] | Foreign government obligations [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale |  | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Foreign government obligations [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 0.0 |
Significant Unobservable Inputs (Level 3) [Member] | U.S. Government Treasury Securities [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | State and local government obligations [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Mortgage and other asset-backed securities [Member] | Short-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Mortgage and other asset-backed securities [Member] | Long-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale | $ 0.0 | 0.0
Significant Unobservable Inputs (Level 3) [Member] | Certificates of Deposit | Short-term investments [Member] |  |
Assets [Abstract] |  |
Debt Securities, Available-for-sale |  | $ 0.0

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