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Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | Apr. 03, 2022 | Oct. 03, 2021
--- | --- | ---
Assets: |  |
Total short-term investments | $ 82.1 | $ 162.2
Total Assets | 4,459.4 | 7,131.5
Liabilities: |  |
Total liabilities | 51.8 | 16.8
Cash and cash equivalents |  |
Assets: |  |
Cash and cash equivalents | 3,913.4 | 6,455.7
Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 8.2 | 87.8
Marketable equity securities | 73.9 | 74.4
Total short-term investments | 82.1 | 162.2
Prepaid Expenses and Other Current Assets [Member] |  |
Assets: |  |
Derivative assets, Current | 64.7 | 147.6
Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 285.6 | 281.7
Other Long-Term Assets [Member] |  |
Assets: |  |
Derivative assets, Noncurrent | 113.6 | 84.3
Accrued Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities, Current | 35.0 | 8.6
Other Long-Term Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities, Noncurrent | 16.8 | 8.2
Auction rate securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities |  | 6.0
Commercial paper | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities |  | 63.0
Corporate debt securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 8.2 | 24.7
Corporate debt securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 139.6 | 162.0
Foreign government obligations | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 3.8 |
Foreign Government Obligations [Member] | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities |  | 4.0
Mortgage and other asset-backed securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities |  | 0.1
Mortgage and other asset-backed securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 58.9 | 31.9
State and local government obligations | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 1.4 | 1.5
U.S. government treasury securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 81.9 | 76.3
Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Total Assets | 4,108.8 | 6,737.5
Liabilities: |  |
Total liabilities | 23.8 | 0.3
Fair Value, Inputs, Level 1 [Member] | Cash and cash equivalents |  |
Assets: |  |
Cash and cash equivalents | 3,913.4 | 6,455.7
Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 0.0 | 0.0
Marketable equity securities | 73.9 | 74.4
Total short-term investments | 73.9 | 74.4
Fair Value, Inputs, Level 1 [Member] | Prepaid Expenses and Other Current Assets [Member] |  |
Assets: |  |
Derivative assets, Current | 39.6 | 131.1
Fair Value, Inputs, Level 1 [Member] | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 81.9 | 76.3
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 | 23.8 | 0.3
Fair Value, Inputs, Level 1 [Member] | Other Long-Term Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities, Noncurrent | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Auction rate securities | Long-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
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 Obligations [Member] | Long-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 | 81.9 | 76.3
Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Total Assets | 350.6 | 388.0
Liabilities: |  |
Total liabilities | 28.0 | 16.5
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 | 8.2 | 87.8
Marketable equity securities | 0.0 | 0.0
Total short-term investments | 8.2 | 87.8
Fair Value, Inputs, Level 2 [Member] | Prepaid Expenses and Other Current Assets [Member] |  |
Assets: |  |
Derivative assets, Current | 25.1 | 16.5
Fair Value, Inputs, Level 2 [Member] | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 203.7 | 199.4
Fair Value, Inputs, Level 2 [Member] | Other Long-Term Assets [Member] |  |
Assets: |  |
Derivative assets, Noncurrent | 113.6 | 84.3
Fair Value, Inputs, Level 2 [Member] | Accrued Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities, Current | 11.2 | 8.3
Fair Value, Inputs, Level 2 [Member] | Other Long-Term Liabilities [Member] |  |
Liabilities: |  |
Derivative liabilities, Noncurrent | 16.8 | 8.2
Fair Value, Inputs, Level 2 [Member] | Auction rate securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities |  | 0.0
Fair Value, Inputs, Level 2 [Member] | Commercial paper | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities |  | 63.0
Fair Value, Inputs, Level 2 [Member] | Corporate debt securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 8.2 | 24.7
Fair Value, Inputs, Level 2 [Member] | Corporate debt securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 139.6 | 162.0
Fair Value, Inputs, Level 2 [Member] | Foreign government obligations | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 3.8 |
Fair Value, Inputs, Level 2 [Member] | Foreign Government Obligations [Member] | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities |  | 4.0
Fair Value, Inputs, Level 2 [Member] | Mortgage and other asset-backed securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities |  | 0.1
Fair Value, Inputs, Level 2 [Member] | Mortgage and other asset-backed securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 58.9 | 31.9
Fair Value, Inputs, Level 2 [Member] | State and local government obligations | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities | 1.4 | 1.5
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 | 0.0 | 6.0
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 | 0.0 | 6.0
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 |  | 6.0
Fair Value, Inputs, Level 3 [Member] | Commercial paper | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities |  | 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 Obligations [Member] | Long-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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