Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions	Jun. 29, 2025	Sep. 29, 2024
Assets:
Total short-term investments	$ 333.3	$ 257.0
Derivative assets, Current	9.7	8.7
Derivative assets, Noncurrent	187.0	179.1
Total Assets	4,934.6	4,007.0
Liabilities:
Derivative liabilities, Current	6.4	29.2
Derivative liabilities, Noncurrent	31.1	56.7
Total liabilities	37.5	85.9
Cash and cash equivalents
Assets:
Cash and cash equivalents	4,172.6	3,286.2
Short-term Investments [Member]
Assets:
Available-for-sale debt securities:	160.6	90.7
Marketable equity securities	88.7	82.2
Structured deposits	84.0	84.1
Total short-term investments	333.3	257.0
Long-term Investments [Member]
Assets:
Available-for-sale debt securities:	232.0	275.8
Structured deposits		0.2
Other Long-Term Investments	232.0	276.0
Corporate debt securities | Short-term Investments [Member]
Assets:
Available-for-sale debt securities:	68.3	51.8
Corporate debt securities | Long-term Investments [Member]
Assets:
Available-for-sale debt securities:	120.6	112.8
Mortgage and other asset-backed securities | Short-term Investments [Member]
Assets:
Available-for-sale debt securities:	0.4	0.4
Mortgage and other asset-backed securities | Long-term Investments [Member]
Assets:
Available-for-sale debt securities:	74.7	64.4
State and local government obligations | Short-term Investments [Member]
Assets:
Available-for-sale debt securities:	1.1	1.4
State and local government obligations | Long-term Investments [Member]
Assets:
Available-for-sale debt securities:	2.7	3.7
U.S. government treasury securities | Short-term Investments [Member]
Assets:
Available-for-sale debt securities:	90.8	36.9
U.S. government treasury securities | Long-term Investments [Member]
Assets:
Available-for-sale debt securities:	34.0	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	4,386.1	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	4,172.6	3,286.2
Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member]
Assets:
Available-for-sale debt securities:	90.8	36.9
Marketable equity securities	88.7	82.2
Structured deposits	0.0	0.0
Total short-term investments	179.5	119.1
Fair Value, Inputs, Level 1 [Member] | Long-term Investments [Member]
Assets:
Available-for-sale debt securities:	34.0	94.9
Structured deposits		0.0
Other Long-Term Investments	34.0	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	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:	90.8	36.9
Fair Value, Inputs, Level 1 [Member] | U.S. government treasury securities | Long-term Investments [Member]
Assets:
Available-for-sale debt securities:	34.0	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	9.7	8.7
Derivative assets, Noncurrent	187.0	179.1
Total Assets	510.9	495.8
Liabilities:
Derivative liabilities, Current	6.4	29.2
Derivative liabilities, Noncurrent	31.1	56.7
Total liabilities	37.5	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:	58.1	53.8
Marketable equity securities	0.0	0.0
Structured deposits	84.0	84.1
Total short-term investments	142.1	137.9
Fair Value, Inputs, Level 2 [Member] | Long-term Investments [Member]
Assets:
Available-for-sale debt securities:	172.1	169.9
Structured deposits		0.2
Other Long-Term Investments	172.1	170.1
Fair Value, Inputs, Level 2 [Member] | Corporate debt securities | Short-term Investments [Member]
Assets:
Available-for-sale debt securities:	56.6	51.8
Fair Value, Inputs, Level 2 [Member] | Corporate debt securities | Long-term Investments [Member]
Assets:
Available-for-sale debt securities:	94.7	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	0.4
Fair Value, Inputs, Level 2 [Member] | Mortgage and other asset-backed securities | Long-term Investments [Member]
Assets:
Available-for-sale debt securities:	74.7	64.4
Fair Value, Inputs, Level 2 [Member] | State and local government obligations | Short-term Investments [Member]
Assets:
Available-for-sale debt securities:	1.1	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	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	37.6	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:	11.7	0.0
Marketable equity securities	0.0	0.0
Structured deposits	0.0	0.0
Total short-term investments	11.7	0.0
Fair Value, Inputs, Level 3 [Member] | Long-term Investments [Member]
Assets:
Available-for-sale debt securities:	25.9	11.0
Structured deposits		0.0
Other Long-Term Investments	25.9	11.0
Fair Value, Inputs, Level 3 [Member] | Corporate debt securities | Short-term Investments [Member]
Assets:
Available-for-sale debt securities:	11.7	0.0
Fair Value, Inputs, Level 3 [Member] | Corporate debt securities | Long-term Investments [Member]
Assets:
Available-for-sale debt securities:	25.9	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