Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	Dec. 28, 2014	Sep. 28, 2014
Assets:
Total short-term investments	$ 96.1us-gaap_ShortTermInvestments	$ 135.4us-gaap_ShortTermInvestments
Available-for-sale securities	307.5	318.4
Total	2,383.7us-gaap_AssetsFairValueDisclosure	2,208.9us-gaap_AssetsFairValueDisclosure
Liabilities:
Total	25.1us-gaap_DerivativeLiabilities
Cash and Cash Equivalents [Member]
Assets:
Cash and cash equivalents	1,857.0	1,708.4
Short-term Investments [Member]
Assets:
Available-for-sale securities	20.1	63.2
Trading securities	76.0	72.2
Total short-term investments	96.1	135.4
Prepaid Expenses and Other Current Assets [Member]
Assets:
Derivative assets	47.6	28.7
Long-term Investments [Member]
Assets:
Available-for-sale securities	307.5	318.4
Other Assets [Member]
Assets:
Derivative assets	75.5	18.0
Accrued Liabilities [Member]
Liabilities:
Derivative liabilities	16.7	2.4
Other Long-Term Liabilities [Member]
Liabilities:
Derivative liabilities	8.4
Fair Value, Inputs, Level 1 [Member]
Assets:
Total	2,040.0	1,887.2
Liabilities:
Total	4.3
Fair Value, Inputs, Level 1 [Member] \| Cash and Cash Equivalents [Member]
Assets:
Cash and cash equivalents	1,857.0	1,708.4
Fair Value, Inputs, Level 1 [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities	7.7	10.9
Trading securities	76.0	72.2
Total short-term investments	83.7	83.1
Fair Value, Inputs, Level 1 [Member] \| Prepaid Expenses and Other Current Assets [Member]
Assets:
Derivative assets	0	0.9
Fair Value, Inputs, Level 1 [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	99.3	94.8
Fair Value, Inputs, Level 1 [Member] \| Other Assets [Member]
Assets:
Derivative assets	0	0
Fair Value, Inputs, Level 1 [Member] \| Accrued Liabilities [Member]
Liabilities:
Derivative liabilities	4.3	0.4
Fair Value, Inputs, Level 1 [Member] \| Other Long-Term Liabilities [Member]
Liabilities:
Derivative liabilities	0
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Total	333.6	307.9
Liabilities:
Total	20.8
Significant Other Observable Inputs (Level 2) [Member] \| Cash and Cash Equivalents [Member]
Assets:
Cash and cash equivalents	0	0
Significant Other Observable Inputs (Level 2) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities	12.4	52.3
Trading securities	0	0
Total short-term investments	12.4	52.3
Significant Other Observable Inputs (Level 2) [Member] \| Prepaid Expenses and Other Current Assets [Member]
Assets:
Derivative assets	47.6	27.8
Significant Other Observable Inputs (Level 2) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	198.1	209.8
Significant Other Observable Inputs (Level 2) [Member] \| Other Assets [Member]
Assets:
Derivative assets	75.5	18.0
Significant Other Observable Inputs (Level 2) [Member] \| Accrued Liabilities [Member]
Liabilities:
Derivative liabilities	12.4	2.0
Significant Other Observable Inputs (Level 2) [Member] \| Other Long-Term Liabilities [Member]
Liabilities:
Derivative liabilities	8.4
Significant Unobservable Inputs (Level 3) [Member]
Assets:
Total	10.1	13.8
Liabilities:
Total	0
Significant Unobservable Inputs (Level 3) [Member] \| Cash and Cash Equivalents [Member]
Assets:
Cash and cash equivalents	0	0
Significant Unobservable Inputs (Level 3) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities	0	0
Trading securities	0	0
Total short-term investments	0	0
Significant Unobservable Inputs (Level 3) [Member] \| Prepaid Expenses and Other Current Assets [Member]
Assets:
Derivative assets	0	0
Significant Unobservable Inputs (Level 3) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	10.1	13.8
Significant Unobservable Inputs (Level 3) [Member] \| Other Assets [Member]
Assets:
Derivative assets	0	0
Significant Unobservable Inputs (Level 3) [Member] \| Accrued Liabilities [Member]
Liabilities:
Derivative liabilities	0	0
Significant Unobservable Inputs (Level 3) [Member] \| Other Long-Term Liabilities [Member]
Liabilities:
Derivative liabilities	0
Agency Obligations [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	8.4	8.9
Agency Obligations [Member] \| Fair Value, Inputs, Level 1 [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	0	0
Agency Obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	8.4	8.9
Agency Obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	0	0
Corporate Debt Securities [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities	10.4	4.9
Corporate Debt Securities [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	120.9	130.9
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities	0	0
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	0	0
Corporate Debt Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities	10.4	4.9
Corporate Debt Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	120.9	130.9
Corporate Debt Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities	0	0
Corporate Debt Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	0	0
Auction Rate Securities [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	10.1	13.8
Auction Rate Securities [Member] \| Fair Value, Inputs, Level 1 [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	0	0
Auction Rate Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	0	0
Auction Rate Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	10.1	13.8
Foreign Government Obligations [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities	2.0	33.7
Foreign Government Obligations [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	14.4	17.4
Foreign Government Obligations [Member] \| Fair Value, Inputs, Level 1 [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities	0	0
Foreign Government Obligations [Member] \| Fair Value, Inputs, Level 1 [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	0	0
Foreign Government Obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities	2.0	33.7
Foreign Government Obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	14.4	17.4
Foreign Government Obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities	0	0
Foreign Government Obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	0	0
US Government Treasury Securities [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities	7.7	10.9
US Government Treasury Securities [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	99.3	94.8
US Government Treasury Securities [Member] \| Fair Value, Inputs, Level 1 [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities	7.7	10.9
US Government Treasury Securities [Member] \| Fair Value, Inputs, Level 1 [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	99.3	94.8
US Government Treasury Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities	0	0
US Government Treasury Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	0	0
US Government Treasury Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities	0	0
US Government Treasury Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	0	0
State and Local Government Obligations [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		12.7
State and Local Government Obligations [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	8.6	6.7
State and Local Government Obligations [Member] \| Fair Value, Inputs, Level 1 [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		0
State and Local Government Obligations [Member] \| Fair Value, Inputs, Level 1 [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	0	0
State and Local Government Obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		12.7
State and Local Government Obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	8.6	6.7
State and Local Government Obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		0
State and Local Government Obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	0	0
Certificates Of Deposit [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		1.0
Certificates Of Deposit [Member] \| Fair Value, Inputs, Level 1 [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		0
Certificates Of Deposit [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		1.0
Certificates Of Deposit [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		0
Mortgage and Asset-backed Securities [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	45.8	45.9
Mortgage and Asset-backed Securities [Member] \| Fair Value, Inputs, Level 1 [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	0	0
Mortgage and Asset-backed Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	45.8	45.9
Mortgage and Asset-backed Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	$ 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 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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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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