Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Sep. 29, 2019	Sep. 30, 2018
Assets [Abstract]
Total short-term investments	$ 70.5	$ 181.5
Available-for-sale Securities, Noncurrent	220.0	267.7
Total assets	3,016.0	9,240.4
Liabilities [Abstract]
Total liabilities	18.2	50.0
Cash and cash equivalents [Member]
Assets [Abstract]
Cash and cash equivalents	2,686.6	8,756.3
Short-term investments [Member]
Assets [Abstract]
Equity Securities, FV-NI	66.5	75.3
Total short-term investments	70.5	181.5
Debt Securities, Available-for-sale	4.0	106.2
Prepaid Expenses and Other Current Assets [Member]
Assets [Abstract]
Prepaid expenses and other current assets: Derivative assets	12.6	24.5
Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	220.0	267.7
Other long-term assets [Member]
Assets [Abstract]
Other long-term assets: Derivative assets	26.3	10.4
Accrued liabilities [Member]
Liabilities [Abstract]
Accrued liabilities: Derivative liabilities	5.7	6.5
Other long-term liabilities [Member]
Liabilities [Abstract]
Other long-term liabilities: Derivative liabilities	12.5	43.5
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Assets [Abstract]
Total assets	2,859.6	8,940.9
Liabilities [Abstract]
Total liabilities	1.1	0.4
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Cash and cash equivalents [Member]
Assets [Abstract]
Cash and cash equivalents	2,686.6	8,756.3
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Short-term investments [Member]
Assets [Abstract]
Equity Securities, FV-NI	66.5	75.3
Total short-term investments	66.5	75.3
Debt Securities, Available-for-sale	0.0	0.0
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Prepaid Expenses and Other Current Assets [Member]
Assets [Abstract]
Prepaid expenses and other current assets: Derivative assets	0.0	1.2
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	106.5	108.1
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Other long-term assets [Member]
Assets [Abstract]
Other long-term assets: Derivative assets	0.0	0.0
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Accrued liabilities [Member]
Liabilities [Abstract]
Accrued liabilities: Derivative liabilities	1.1	0.4
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Other long-term liabilities [Member]
Liabilities [Abstract]
Other long-term liabilities: Derivative liabilities	0.0	0.0
Significant Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
Total assets	150.6	293.6
Liabilities [Abstract]
Total liabilities	17.1	49.6
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]
Equity Securities, FV-NI	0.0	0.0
Total short-term investments	4.0	106.2
Debt Securities, Available-for-sale	4.0	106.2
Significant Other Observable Inputs (Level 2) [Member] \| Prepaid Expenses and Other Current Assets [Member]
Assets [Abstract]
Prepaid expenses and other current assets: Derivative assets	12.6	23.3
Significant Other Observable Inputs (Level 2) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	107.7	153.7
Significant Other Observable Inputs (Level 2) [Member] \| Other long-term assets [Member]
Assets [Abstract]
Other long-term assets: Derivative assets	26.3	10.4
Significant Other Observable Inputs (Level 2) [Member] \| Accrued liabilities [Member]
Liabilities [Abstract]
Accrued liabilities: Derivative liabilities	4.6	6.1
Significant Other Observable Inputs (Level 2) [Member] \| Other long-term liabilities [Member]
Liabilities [Abstract]
Other long-term liabilities: Derivative liabilities	12.5	43.5
Significant Unobservable Inputs (Level 3) [Member]
Assets [Abstract]
Total assets	5.8	5.9
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]
Equity Securities, FV-NI	0.0	0.0
Total short-term investments	0.0	0.0
Debt Securities, Available-for-sale	0.0	0.0
Significant Unobservable Inputs (Level 3) [Member] \| Prepaid Expenses and Other Current Assets [Member]
Assets [Abstract]
Prepaid expenses and other current assets: Derivative assets	0.0	0.0
Significant Unobservable Inputs (Level 3) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	5.8	5.9
Significant Unobservable Inputs (Level 3) [Member] \| Other long-term assets [Member]
Assets [Abstract]
Other long-term assets: Derivative assets	0.0	0.0
Significant Unobservable Inputs (Level 3) [Member] \| Accrued liabilities [Member]
Liabilities [Abstract]
Accrued liabilities: Derivative liabilities	0.0	0.0
Significant Unobservable Inputs (Level 3) [Member] \| Other long-term liabilities [Member]
Liabilities [Abstract]
Other long-term liabilities: Derivative liabilities	0.0	0.0
Agency obligations [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale		5.9
Agency obligations [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale		0.0
Agency obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale		5.9
Agency obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale		0.0
Commercial Paper [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.5	8.4
Commercial Paper [Member] \| 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
Commercial Paper [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.5	8.4
Commercial Paper [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	0.0
Corporate debt securities [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	3.5	91.8
Corporate debt securities [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	101.2	114.5
Corporate debt securities [Member] \| 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
Corporate debt securities [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	0.0
Corporate debt securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	3.5	91.8
Corporate debt securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	101.2	114.5
Corporate debt securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	0.0
Corporate debt securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	0.0
Auction rate securities [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	5.8	5.9
Auction rate securities [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	0.0
Auction rate securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	0.0
Auction rate securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	5.8	5.9
Foreign government obligations [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale		6.0
Foreign government obligations [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale		3.6
Foreign government obligations [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale		0.0
Foreign government obligations [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale		0.0
Foreign government obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale		6.0
Foreign government obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale		3.6
Foreign government obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Short-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale		0.0
Foreign government obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale		0.0
U.S. government treasury securities [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	106.5	108.1
U.S. government treasury securities [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	106.5	108.1
U.S. government treasury securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	0.0
U.S. government treasury securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	0.0
State and local government obligations [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	4.9	4.8
State and local government obligations [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	0.0
State and local government obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	4.9	4.8
State and local government obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	0.0
Mortgage and other asset-backed securities [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	1.6	24.9
Mortgage and other asset-backed securities [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	0.0	0.0
Mortgage and other asset-backed securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	1.6	24.9
Mortgage and other asset-backed securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term investments [Member]
Assets [Abstract]
Debt Securities, Available-for-sale	$ 0.0	$ 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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Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

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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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