Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Sep. 27, 2020	Sep. 29, 2019
Assets [Abstract]
Total short-term investments	$ 281.2	$ 70.5
Total assets	4,941.1	3,016.0
Liabilities [Abstract]
Total liabilities	86.6	18.2
Cash and cash equivalents [Member]
Assets [Abstract]
Cash and cash equivalents	4,350.9	2,686.6
Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	216.3	4.0
Equity Securities, FV-NI	64.9	66.5
Total short-term investments	281.2	70.5
Prepaid Expenses and Other Current Assets [Member]
Assets [Abstract]
Derivative assets, Current	15.6	12.6
Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	206.1	220.0
Other long-term assets [Member]
Assets [Abstract]
Derivative assets, Noncurrent	87.3	26.3
Accrued liabilities [Member]
Liabilities [Abstract]
Derivative liabilities, Current	7.3	5.7
Other long-term liabilities [Member]
Liabilities [Abstract]
Derivative liabilities, Noncurrent	79.3	12.5
Commercial Paper [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	66.8	0.5
Corporate debt securities [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	123.6	3.5
Corporate debt securities [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	82.6	101.2
Auction rate securities [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	5.7	5.8
Foreign government obligations [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	8.5
U.S. Government Treasury Securities [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	94.9	106.5
State and local government obligations [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	3.6	4.9
Mortgage and other asset-backed securities [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	15.8
Mortgage and other asset-backed securities [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	19.3	1.6
Certificates of Deposit \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	1.6
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Assets [Abstract]
Total assets	4,514.3	2,859.6
Liabilities [Abstract]
Total liabilities	2.0	1.1
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Cash and cash equivalents [Member]
Assets [Abstract]
Cash and cash equivalents	4,350.9	2,686.6
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	0.0
Equity Securities, FV-NI	64.9	66.5
Total short-term investments	64.9	66.5
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Prepaid Expenses and Other Current Assets [Member]
Assets [Abstract]
Derivative assets, Current	3.6	0.0
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	94.9	106.5
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Other long-term assets [Member]
Assets [Abstract]
Derivative assets, Noncurrent	0.0	0.0
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Accrued liabilities [Member]
Liabilities [Abstract]
Derivative liabilities, Current	1.9	1.1
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Other long-term liabilities [Member]
Liabilities [Abstract]
Derivative liabilities, Noncurrent	0.1	0.0
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Commercial Paper [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	0.0
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Corporate debt securities [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	0.0
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Corporate debt securities [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	0.0
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Auction rate securities [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	0.0
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Foreign government obligations [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| U.S. Government Treasury Securities [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	94.9	106.5
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| State and local government obligations [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	0.0
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Mortgage and other asset-backed securities [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Mortgage and other asset-backed securities [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	0.0
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Certificates of Deposit \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0
Significant Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
Total assets	421.1	150.6
Liabilities [Abstract]
Total liabilities	84.6	17.1
Significant Other Observable Inputs (Level 2) [Member] \| Cash and cash equivalents [Member]
Assets [Abstract]
Cash and cash equivalents	0.0	0.0
Significant Other Observable Inputs (Level 2) [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	216.3	4.0
Equity Securities, FV-NI	0.0	0.0
Total short-term investments	216.3	4.0
Significant Other Observable Inputs (Level 2) [Member] \| Prepaid Expenses and Other Current Assets [Member]
Assets [Abstract]
Derivative assets, Current	12.0	12.6
Significant Other Observable Inputs (Level 2) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	105.5	107.7
Significant Other Observable Inputs (Level 2) [Member] \| Other long-term assets [Member]
Assets [Abstract]
Derivative assets, Noncurrent	87.3	26.3
Significant Other Observable Inputs (Level 2) [Member] \| Accrued liabilities [Member]
Liabilities [Abstract]
Derivative liabilities, Current	5.4	4.6
Significant Other Observable Inputs (Level 2) [Member] \| Other long-term liabilities [Member]
Liabilities [Abstract]
Derivative liabilities, Noncurrent	79.2	12.5
Significant Other Observable Inputs (Level 2) [Member] \| Commercial Paper [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	66.8	0.5
Significant Other Observable Inputs (Level 2) [Member] \| Corporate debt securities [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	123.6	3.5
Significant Other Observable Inputs (Level 2) [Member] \| Corporate debt securities [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	82.6	101.2
Significant Other Observable Inputs (Level 2) [Member] \| Auction rate securities [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	0.0
Significant Other Observable Inputs (Level 2) [Member] \| Foreign government obligations [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	8.5
Significant Other Observable Inputs (Level 2) [Member] \| U.S. Government Treasury Securities [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	0.0
Significant Other Observable Inputs (Level 2) [Member] \| State and local government obligations [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	3.6	4.9
Significant Other Observable Inputs (Level 2) [Member] \| Mortgage and other asset-backed securities [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	15.8
Significant Other Observable Inputs (Level 2) [Member] \| Mortgage and other asset-backed securities [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	19.3	1.6
Significant Other Observable Inputs (Level 2) [Member] \| Certificates of Deposit \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	1.6
Significant Unobservable Inputs (Level 3) [Member]
Assets [Abstract]
Total assets	5.7	5.8
Liabilities [Abstract]
Total liabilities	0.0	0.0
Significant Unobservable Inputs (Level 3) [Member] \| Cash and cash equivalents [Member]
Assets [Abstract]
Cash and cash equivalents	0.0	0.0
Significant Unobservable Inputs (Level 3) [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	0.0
Equity Securities, FV-NI	0.0	0.0
Total short-term investments	0.0	0.0
Significant Unobservable Inputs (Level 3) [Member] \| Prepaid Expenses and Other Current Assets [Member]
Assets [Abstract]
Derivative assets, Current	0.0	0.0
Significant Unobservable Inputs (Level 3) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	5.7	5.8
Significant Unobservable Inputs (Level 3) [Member] \| Other long-term assets [Member]
Assets [Abstract]
Derivative assets, Noncurrent	0.0	0.0
Significant Unobservable Inputs (Level 3) [Member] \| Accrued liabilities [Member]
Liabilities [Abstract]
Derivative liabilities, Current	0.0	0.0
Significant Unobservable Inputs (Level 3) [Member] \| Other long-term liabilities [Member]
Liabilities [Abstract]
Derivative liabilities, Noncurrent	0.0	0.0
Significant Unobservable Inputs (Level 3) [Member] \| Commercial Paper [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	0.0
Significant Unobservable Inputs (Level 3) [Member] \| Corporate debt securities [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	0.0
Significant Unobservable Inputs (Level 3) [Member] \| Corporate debt securities [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	0.0
Significant Unobservable Inputs (Level 3) [Member] \| Auction rate securities [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	5.7	5.8
Significant Unobservable Inputs (Level 3) [Member] \| Foreign government obligations [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0
Significant Unobservable Inputs (Level 3) [Member] \| U.S. Government Treasury Securities [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	0.0
Significant Unobservable Inputs (Level 3) [Member] \| State and local government obligations [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	0.0
Significant Unobservable Inputs (Level 3) [Member] \| Mortgage and other asset-backed securities [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0
Significant Unobservable Inputs (Level 3) [Member] \| Mortgage and other asset-backed securities [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	$ 0.0
Significant Unobservable Inputs (Level 3) [Member] \| Certificates of Deposit \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	$ 0.0

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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