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Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | Jun. 27, 2021 | Sep. 27, 2020
--- | --- | ---
Assets: |  |
Total short-term investments | $ 153.6 | $ 281.2
Total Assets | 5,353.0 | 4,941.1
Liabilities: |  |
Total liabilities | 34.1 | 86.6
Cash and cash equivalents |  |
Assets: |  |
Cash and cash equivalents | 4,753.1 | 4,350.9
Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 79.1 | 216.3
Marketable equity securities | 74.5 | 64.9
Total short-term investments | 153.6 | 281.2
Prepaid Expenses and Other Current Assets [Member] |  |
Assets: |  |
Derivative assets, Current | 76.8 | 15.6
Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 285.9 | 206.1
Other Long-Term Assets [Member] |  |
Assets: |  |
Derivative assets, Noncurrent | 83.6 | 87.3
Accrued Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities, Current | 17.6 | 7.3
Other Long-Term Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities, Noncurrent | 16.5 | 79.3
Auction rate securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 5.8 | 5.7
Certificates of deposit | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities |  | 1.6
Commercial paper | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 57.0 | 66.8
Corporate debt securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 22.1 | 123.6
Corporate debt securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 164.0 | 82.6
Foreign government obligations | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 4.0 |
Foreign Government Short-term Debt Securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities |  | 8.5
Mortgage and other asset-backed securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities |  | 15.8
Mortgage and other asset-backed securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 25.1 | 19.3
State and local government obligations | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 1.5 | 3.6
U.S. government treasury securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 85.5 | 94.9
Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Total Assets | 4,976.3 | 4,514.3
Liabilities: |  |
Total liabilities | 1.1 | 2.0
Fair Value, Inputs, Level 1 [Member] | Cash and cash equivalents |  |
Assets: |  |
Cash and cash equivalents | 4,753.1 | 4,350.9
Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 0.0 | 0.0
Marketable equity securities | 74.5 | 64.9
Total short-term investments | 74.5 | 64.9
Fair Value, Inputs, Level 1 [Member] | Prepaid Expenses and Other Current Assets [Member] |  |
Assets: |  |
Derivative assets, Current | 63.2 | 3.6
Fair Value, Inputs, Level 1 [Member] | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 85.5 | 94.9
Fair Value, Inputs, Level 1 [Member] | Other Long-Term Assets [Member] |  |
Assets: |  |
Derivative assets, Noncurrent | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Accrued Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities, Current | 1.1 | 1.9
Fair Value, Inputs, Level 1 [Member] | Other Long-Term Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities, Noncurrent | 0.0 | 0.1
Fair Value, Inputs, Level 1 [Member] | Auction rate securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Certificates of deposit | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities |  | 0.0
Fair Value, Inputs, Level 1 [Member] | Commercial paper | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Corporate debt securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Corporate debt securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Foreign government obligations | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 0.0 |
Fair Value, Inputs, Level 1 [Member] | Foreign Government Short-term Debt Securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities |  | 0.0
Fair Value, Inputs, Level 1 [Member] | Mortgage and other asset-backed securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities |  | 0.0
Fair Value, Inputs, Level 1 [Member] | Mortgage and other asset-backed securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | State and local government obligations | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | U.S. government treasury securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 85.5 | 94.9
Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Total Assets | 370.9 | 421.1
Liabilities: |  |
Total liabilities | 33.0 | 84.6
Fair Value, Inputs, Level 2 [Member] | Cash and cash equivalents |  |
Assets: |  |
Cash and cash equivalents | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 79.1 | 216.3
Marketable equity securities | 0.0 | 0.0
Total short-term investments | 79.1 | 216.3
Fair Value, Inputs, Level 2 [Member] | Prepaid Expenses and Other Current Assets [Member] |  |
Assets: |  |
Derivative assets, Current | 13.6 | 12.0
Fair Value, Inputs, Level 2 [Member] | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 194.6 | 105.5
Fair Value, Inputs, Level 2 [Member] | Other Long-Term Assets [Member] |  |
Assets: |  |
Derivative assets, Noncurrent | 83.6 | 87.3
Fair Value, Inputs, Level 2 [Member] | Accrued Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities, Current | 16.5 | 5.4
Fair Value, Inputs, Level 2 [Member] | Other Long-Term Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities, Noncurrent | 16.5 | 79.2
Fair Value, Inputs, Level 2 [Member] | Auction rate securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | Certificates of deposit | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities |  | 1.6
Fair Value, Inputs, Level 2 [Member] | Commercial paper | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 57.0 | 66.8
Fair Value, Inputs, Level 2 [Member] | Corporate debt securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 22.1 | 123.6
Fair Value, Inputs, Level 2 [Member] | Corporate debt securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 164.0 | 82.6
Fair Value, Inputs, Level 2 [Member] | Foreign government obligations | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 4.0 |
Fair Value, Inputs, Level 2 [Member] | Foreign Government Short-term Debt Securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities |  | 8.5
Fair Value, Inputs, Level 2 [Member] | Mortgage and other asset-backed securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities |  | 15.8
Fair Value, Inputs, Level 2 [Member] | Mortgage and other asset-backed securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 25.1 | 19.3
Fair Value, Inputs, Level 2 [Member] | State and local government obligations | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 1.5 | 3.6
Fair Value, Inputs, Level 2 [Member] | U.S. government treasury securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] |  |
Assets: |  |
Total Assets | 5.8 | 5.7
Liabilities: |  |
Total liabilities | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | Cash and cash equivalents |  |
Assets: |  |
Cash and cash equivalents | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 0.0 | 0.0
Marketable equity securities | 0.0 | 0.0
Total short-term investments | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | Prepaid Expenses and Other Current Assets [Member] |  |
Assets: |  |
Derivative assets, Current | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 5.8 | 5.7
Fair Value, Inputs, Level 3 [Member] | Other Long-Term Assets [Member] |  |
Assets: |  |
Derivative assets, Noncurrent | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | Accrued Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities, Current | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | Other Long-Term Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities, Noncurrent | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | Auction rate securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 5.8 | 5.7
Fair Value, Inputs, Level 3 [Member] | Certificates of deposit | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities |  | 0.0
Fair Value, Inputs, Level 3 [Member] | Commercial paper | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | Corporate debt securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | Corporate debt securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | Foreign government obligations | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 0.0 |
Fair Value, Inputs, Level 3 [Member] | Foreign Government Short-term Debt Securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities |  | 0.0
Fair Value, Inputs, Level 3 [Member] | Mortgage and other asset-backed securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities |  | 0.0
Fair Value, Inputs, Level 3 [Member] | Mortgage and other asset-backed securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | State and local government obligations | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | U.S. government treasury securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | $ 0.0 | $ 0.0

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