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Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | Mar. 30, 2025 | Sep. 29, 2024
--- | --- | ---
Assets: |  |
Total short-term investments | $ 340.2 | $ 257.0
Derivative assets, Current | 51.2 | 8.7
Derivative assets, Noncurrent | 271.7 | 179.1
Total Assets | 3,556.6 | 4,007.0
Liabilities: |  |
Derivative liabilities, Current | 0.9 | 29.2
Derivative liabilities, Noncurrent | 22.4 | 56.7
Total liabilities | 23.3 | 85.9
Cash and cash equivalents |  |
Assets: |  |
Cash and cash equivalents | 2,671.4 | 3,286.2
Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: | 163.7 | 90.7
Marketable equity securities | 79.7 | 82.2
Structured deposits | 96.8 | 84.1
Total short-term investments | 340.2 | 257.0
Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: | 222.1 | 275.8
Structured deposits |  | 0.2
Other Long-Term Investments | 222.1 | 276.0
Corporate debt securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: | 82.4 | 51.8
Corporate debt securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: | 110.3 | 112.8
Mortgage and other asset-backed securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: |  | 0.4
Mortgage and other asset-backed securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: | 68.0 | 64.4
State and local government obligations | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: |  | 1.4
State and local government obligations | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: | 3.8 | 3.7
U.S. government treasury securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: | 81.3 | 36.9
U.S. government treasury securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: | 40.0 | 94.9
Corporate Bond Securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: |  | 0.2
Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Derivative assets, Current | 0.0 | 0.0
Derivative assets, Noncurrent | 0.0 | 0.0
Total Assets | 2,872.4 | 3,500.2
Liabilities: |  |
Derivative liabilities, Current | 0.0 | 0.0
Derivative liabilities, Noncurrent | 0.0 | 0.0
Total liabilities | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Cash and cash equivalents |  |
Assets: |  |
Cash and cash equivalents | 2,671.4 | 3,286.2
Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: | 81.3 | 36.9
Marketable equity securities | 79.7 | 82.2
Structured deposits | 0.0 | 0.0
Total short-term investments | 161.0 | 119.1
Fair Value, Inputs, Level 1 [Member] | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: | 40.0 | 94.9
Structured deposits |  | 0.0
Other Long-Term Investments | 40.0 | 94.9
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] | 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 | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: |  | 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 | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: | 81.3 | 36.9
Fair Value, Inputs, Level 1 [Member] | U.S. government treasury securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: | 40.0 | 94.9
Fair Value, Inputs, Level 1 [Member] | Corporate Bond Securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: |  | 0.0
Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Derivative assets, Current | 51.2 | 8.7
Derivative assets, Noncurrent | 271.7 | 179.1
Total Assets | 647.6 | 495.8
Liabilities: |  |
Derivative liabilities, Current | 0.9 | 29.2
Derivative liabilities, Noncurrent | 22.4 | 56.7
Total liabilities | 23.3 | 85.9
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: | 71.0 | 53.8
Marketable equity securities | 0.0 | 0.0
Structured deposits | 96.8 | 84.1
Total short-term investments | 167.8 | 137.9
Fair Value, Inputs, Level 2 [Member] | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: | 156.9 | 169.9
Structured deposits |  | 0.2
Other Long-Term Investments | 156.9 | 170.1
Fair Value, Inputs, Level 2 [Member] | Corporate debt securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: | 71.0 | 51.8
Fair Value, Inputs, Level 2 [Member] | Corporate debt securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: | 85.1 | 101.8
Fair Value, Inputs, Level 2 [Member] | Mortgage and other asset-backed securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: |  | 0.4
Fair Value, Inputs, Level 2 [Member] | Mortgage and other asset-backed securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: | 68.0 | 64.4
Fair Value, Inputs, Level 2 [Member] | State and local government obligations | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: |  | 1.4
Fair Value, Inputs, Level 2 [Member] | State and local government obligations | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: | 3.8 | 3.7
Fair Value, Inputs, Level 2 [Member] | U.S. government treasury securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: | 0.0 | 0.0
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 2 [Member] | Corporate Bond Securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: |  | 0.2
Fair Value, Inputs, Level 3 [Member] |  |
Assets: |  |
Derivative assets, Current | 0.0 | 0.0
Derivative assets, Noncurrent | 0.0 | 0.0
Total Assets | 36.6 | 11.0
Liabilities: |  |
Derivative liabilities, Current | 0.0 | 0.0
Derivative liabilities, Noncurrent | 0.0 | 0.0
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: | 11.4 | 0.0
Marketable equity securities | 0.0 | 0.0
Structured deposits | 0.0 | 0.0
Total short-term investments | 11.4 | 0.0
Fair Value, Inputs, Level 3 [Member] | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: | 25.2 | 11.0
Structured deposits |  | 0.0
Other Long-Term Investments | 25.2 | 11.0
Fair Value, Inputs, Level 3 [Member] | Corporate debt securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: | 11.4 | 0.0
Fair Value, Inputs, Level 3 [Member] | Corporate debt securities | Long-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: | 25.2 | 11.0
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 | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: |  | 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 | Short-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
Fair Value, Inputs, Level 3 [Member] | Corporate Bond Securities | Short-term Investments [Member] |  |
Assets: |  |
Available-for-sale debt securities: |  | $ 0.0

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