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Fair Value Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified	6 Months Ended
	Apr. 03, 2015	Oct. 03, 2014
Fair Value, Assets [Roll Forward]
Auction rate securities Ending Balance	$ 2.3us-gaap_AvailableForSaleSecurities
Foreign currency derivative, beginning balance	3.3us-gaap_DerivativeAssets
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets [Roll Forward]
Auction rate securities Beginning Balance		2.3
Foreign currency derivative, beginning balance		0.7
Auction rate securities Ending Balance	2.3	2.3
Foreign currency derivative, beginning balance	3.3	0.7
Fair Value, Inputs, Level 3 [Member] \| Auction Rate Securities [Member]
Fair Value, Assets [Roll Forward]
Changes in fair value included in earnings	0
Fair Value, Inputs, Level 3 [Member] \| Derivative [Member]
Fair Value, Assets [Roll Forward]
Changes in fair value included in earnings	$ 2.6

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. Includes assets not subject to a master netting arrangement and not elected to be offset.

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