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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