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Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Millions
Dec. 29, 2024
Sep. 29, 2024
Assets:    
Total short-term investments $ 285.8 $ 257.0
Derivative assets, Current 56.9 8.7
Derivative assets, Noncurrent 295.6 179.1
Total Assets 4,537.0 4,007.0
Liabilities:    
Derivative liabilities, Current 0.6 29.2
Derivative liabilities, Noncurrent 32.4 56.7
Total liabilities 33.0 85.9
Cash and cash equivalents    
Assets:    
Cash and cash equivalents 3,671.4 3,286.2
Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 160.9 90.7
Marketable equity securities 83.6 82.2
Structured deposits 41.3 84.1
Total short-term investments 285.8 257.0
Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 227.3 275.8
Corporate debt securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 74.6 51.8
Corporate debt securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 116.8 112.8
Mortgage and other asset-backed securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 0.3 0.4
Mortgage and other asset-backed securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 67.0 64.4
State and local government obligations | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 1.5 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: 84.2 36.9
U.S. government treasury securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 39.7 94.9
Corporate Bond Securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 0.3 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 3,878.9 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 3,671.4 3,286.2
Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 84.2 36.9
Marketable equity securities 83.6 82.2
Structured deposits 0.0 0.0
Total short-term investments 167.8 119.1
Fair Value, Inputs, Level 1 [Member] | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 39.7 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 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 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: 84.2 36.9
Fair Value, Inputs, Level 1 [Member] | U.S. government treasury securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 39.7 94.9
Fair Value, Inputs, Level 1 [Member] | Corporate Bond Securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 0.0 0.0
Fair Value, Inputs, Level 2 [Member]    
Assets:    
Derivative assets, Current 56.9 8.7
Derivative assets, Noncurrent 295.6 179.1
Total Assets 622.5 495.8
Liabilities:    
Derivative liabilities, Current 0.6 29.2
Derivative liabilities, Noncurrent 32.4 56.7
Total liabilities 33.0 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: 65.5 53.8
Marketable equity securities 0.0 0.0
Structured deposits 41.3 84.1
Total short-term investments 106.8 137.9
Fair Value, Inputs, Level 2 [Member] | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 163.2 169.9
Fair Value, Inputs, Level 2 [Member] | Corporate debt securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 63.4 51.8
Fair Value, Inputs, Level 2 [Member] | Corporate debt securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 92.4 101.8
Fair Value, Inputs, Level 2 [Member] | Mortgage and other asset-backed securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 0.3 0.4
Fair Value, Inputs, Level 2 [Member] | Mortgage and other asset-backed securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 67.0 64.4
Fair Value, Inputs, Level 2 [Member] | State and local government obligations | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 1.5 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: 0.3 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 35.6 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: 11.2 0.0
Marketable equity securities 0.0 0.0
Structured deposits 0.0 0.0
Total short-term investments 11.2 0.0
Fair Value, Inputs, Level 3 [Member] | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 24.4 11.0
Fair Value, Inputs, Level 3 [Member] | Corporate debt securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 11.2 0.0
Fair Value, Inputs, Level 3 [Member] | Corporate debt securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 24.4 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 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 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 $ 0.0