Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Oct. 01, 2017	Oct. 02, 2016
Assets [Abstract]
Total short-term investments	$ 228.6	$ 134.4
Long-term investments: Available-for-sale securities	542.3	1,141.7
Total assets	3,271.0	3,439.0
Liabilities [Abstract]
Total liabilities	38.5	89.6
Cash and cash equivalents [Member]
Assets [Abstract]
Cash and cash equivalents	2,462.3	2,128.8
Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	151.7	65.7
Short-term investments: Trading securities	76.9	68.7
Total short-term investments	228.6	134.4
Prepaid expenses and other current assets [Member]
Assets [Abstract]
Prepaid expenses and other current assets: Derivative assets	13.4	27.7
Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	542.3	1,141.7
Other long-term assets [Member]
Assets [Abstract]
Other long-term assets: Derivative assets	24.4	6.4
Accrued liabilities [Member]
Liabilities [Abstract]
Accrued liabilities: Derivative liabilities	16.4	18.0
Other long-term liabilities [Member]
Liabilities [Abstract]
Other long-term liabilities: Derivative liabilities	22.1	71.6
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Assets [Abstract]
Total assets	2,748.1	2,574.6
Liabilities [Abstract]
Total liabilities	2.5	1.7
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Cash and cash equivalents [Member]
Assets [Abstract]
Cash and cash equivalents	2,462.3	2,128.8
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	81.4	15.8
Short-term investments: Trading securities	76.9	68.7
Total short-term investments	158.3	84.5
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	0.1	3.1
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	127.4	358.2
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	2.5	1.7
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	517.0	858.7
Liabilities [Abstract]
Total liabilities	36.0	87.9
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]
Short-term investments: Available-for-sale securities	70.3	49.9
Short-term investments: Trading securities	0.0	0.0
Total short-term investments	70.3	49.9
Significant Other Observable Inputs (Level 2) [Member] \| Prepaid expenses and other current assets [Member]
Assets [Abstract]
Prepaid expenses and other current assets: Derivative assets	13.3	24.6
Significant Other Observable Inputs (Level 2) [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	409.0	777.8
Significant Other Observable Inputs (Level 2) [Member] \| Other long-term assets [Member]
Assets [Abstract]
Other long-term assets: Derivative assets	24.4	6.4
Significant Other Observable Inputs (Level 2) [Member] \| Accrued liabilities [Member]
Liabilities [Abstract]
Accrued liabilities: Derivative liabilities	13.9	16.3
Significant Other Observable Inputs (Level 2) [Member] \| Other long-term liabilities [Member]
Liabilities [Abstract]
Other long-term liabilities: Derivative liabilities	22.1	71.6
Significant Unobservable Inputs (Level 3) [Member]
Assets [Abstract]
Total assets	5.9	5.7
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]
Short-term investments: Available-for-sale securities	0.0	0.0
Short-term investments: Trading securities	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]
Prepaid expenses and other current assets: Derivative assets	0.0	0.0
Significant Unobservable Inputs (Level 3) [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	5.9	5.7
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
Certificates of Deposit [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	2.3	5.8
Certificates of Deposit [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	0.0	0.0
Certificates of Deposit [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	2.3	5.8
Certificates of Deposit [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	0.0	0.0
Agency obligations [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	7.5	1.3
Agency obligations [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	21.8	44.4
Agency obligations [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	0.0	0.0
Agency obligations [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	0.0	0.0
Agency obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	7.5	1.3
Agency obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	21.8	44.4
Agency obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	0.0	0.0
Agency obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	0.0	0.0
Commercial Paper [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	2.0	2.6
Commercial Paper [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	0.0	0.0
Commercial Paper [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	2.0	2.6
Commercial Paper [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	0.0	0.0
Corporate debt securities [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	49.4	34.2
Corporate debt securities [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	207.4	459.3
Corporate debt securities [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	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]
Long-term investments: Available-for-sale securities	0.0	0.0
Corporate debt securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	49.4	34.2
Corporate debt securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	207.4	459.3
Corporate debt securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	0.0	0.0
Corporate debt securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	0.0	0.0
Auction rate securities [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	5.9	5.7
Auction rate securities [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	0.0	0.0
Auction rate securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	0.0	0.0
Auction rate securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	5.9	5.7
Foreign government obligations [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	7.1	5.5
Foreign government obligations [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	17.1	46.7
Foreign government obligations [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	0.0	0.0
Foreign government obligations [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	0.0	0.0
Foreign government obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	7.1	5.5
Foreign government obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	17.1	46.7
Foreign government obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	0.0	0.0
Foreign government obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	0.0	0.0
U.S. government treasury securities [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	81.4	15.8
U.S. government treasury securities [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	127.4	358.2
U.S. government treasury securities [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	81.4	15.8
U.S. government treasury securities [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	127.4	358.2
U.S. government treasury securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	0.0	0.0
U.S. government treasury securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	0.0	0.0
U.S. government treasury securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	0.0	0.0
U.S. government treasury securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	0.0	0.0
State and local government obligations [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities		0.5
State and local government obligations [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	7.0	57.5
State and local government obligations [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities		0.0
State and local government obligations [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	0.0	0.0
State and local government obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities		0.5
State and local government obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	7.0	57.5
State and local government obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities		0.0
State and local government obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	0.0	0.0
Mortgage and other asset-backed securities [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	2.0
Mortgage and other asset-backed securities [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	155.7	169.9
Mortgage and other asset-backed securities [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	0.0
Mortgage and other asset-backed securities [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	0.0	0.0
Mortgage and other asset-backed securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	2.0
Mortgage and other asset-backed securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	155.7	169.9
Mortgage and other asset-backed securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Short-term investments [Member]
Assets [Abstract]
Short-term investments: Available-for-sale securities	0.0
Mortgage and other asset-backed securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term investments [Member]
Assets [Abstract]
Long-term investments: Available-for-sale securities	$ 0.0	$ 0.0

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- Definition

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 and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

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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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- Definition

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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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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