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Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Oct. 01, 2023
Assets:    
Total short-term investments $ 362.5 $ 401.5
Derivative assets, Current 48.1 41.0
Derivative assets, Noncurrent 181.2 153.0
Total Assets 3,636.3 4,394.3
Liabilities:    
Derivative liabilities, Current 5.5 3.6
Derivative liabilities, Noncurrent 35.1 43.2
Derivative Liabilities 40.6  
Total liabilities   46.8
Cash and cash equivalents    
Assets:    
Cash and cash equivalents 2,764.1 3,551.5
Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities 56.1 70.7
Marketable equity securities 84.5 69.6
Total short-term investments 362.5 401.5
Structured deposits 221.9 261.2
Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities 280.2 247.3
Other Long-Term Assets [Member]    
Assets:    
Structured deposits 0.2  
Corporate debt securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities 37.7 64.0
Corporate debt securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities 127.4 91.1
Foreign Government Short-term Debt Securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities   3.9
Mortgage and other asset-backed securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities 0.3  
Mortgage and other asset-backed securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities 52.6 50.2
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 2.7 1.3
U.S. government treasury securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities 16.5 2.8
U.S. government treasury securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities 97.5 104.7
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 2,962.6 3,728.6
Liabilities:    
Derivative liabilities, Current 0.0 0.0
Derivative liabilities, Noncurrent 0.0 0.0
Derivative Liabilities 0.0  
Total liabilities   0.0
Fair Value, Inputs, Level 1 [Member] | Cash and cash equivalents    
Assets:    
Cash and cash equivalents 2,764.1 3,551.5
Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities 16.5 2.8
Marketable equity securities 84.5 69.6
Total short-term investments 101.0 72.4
Structured deposits 0.0 0.0
Fair Value, Inputs, Level 1 [Member] | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities 97.5 104.7
Fair Value, Inputs, Level 1 [Member] | Other Long-Term Assets [Member]    
Assets:    
Structured deposits 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 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 | 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 16.5 2.8
Fair Value, Inputs, Level 1 [Member] | U.S. government treasury securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities 97.5 104.7
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 48.1 41.0
Derivative assets, Noncurrent 181.2 153.0
Total Assets 663.2 665.7
Liabilities:    
Derivative liabilities, Current 5.5 3.6
Derivative liabilities, Noncurrent 35.1 43.2
Derivative Liabilities 40.6  
Total liabilities   46.8
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 39.6 67.9
Marketable equity securities 0.0 0.0
Total short-term investments 261.5 329.1
Structured deposits 221.9 261.2
Fair Value, Inputs, Level 2 [Member] | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities 172.2 142.6
Fair Value, Inputs, Level 2 [Member] | Other Long-Term Assets [Member]    
Assets:    
Structured deposits 0.2  
Fair Value, Inputs, Level 2 [Member] | Corporate debt securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities 37.7 64.0
Fair Value, Inputs, Level 2 [Member] | Corporate debt securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities 116.9 91.1
Fair Value, Inputs, Level 2 [Member] | Foreign Government Short-term Debt Securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities   3.9
Fair Value, Inputs, Level 2 [Member] | Mortgage and other asset-backed securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities 0.3  
Fair Value, Inputs, Level 2 [Member] | Mortgage and other asset-backed securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities 52.6 50.2
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 2.7 1.3
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 10.5 0.0
Liabilities:    
Derivative liabilities, Current 0.0 0.0
Derivative liabilities, Noncurrent 0.0 0.0
Derivative Liabilities 0.0  
Total liabilities   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
Structured deposits 0.0 0.0
Fair Value, Inputs, Level 3 [Member] | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities 10.5 0.0
Fair Value, Inputs, Level 3 [Member] | Other Long-Term Assets [Member]    
Assets:    
Structured deposits 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 10.5 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 | 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