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Financial Instruments and Risk Management, Offsetting Derivative Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 27, 2014	Sep. 27, 2014
Asset Derivatives [Abstracts]
Gross amounts	$ 22,554	$ 11,672
Effects of netting	(4,627)	(7,686)
Net amounts presented in the balance sheet	17,927	3,986
Commodity-Related Derivatives [Member]
Asset Derivatives [Abstracts]
Gross amounts	20,694	9,533
Effects of netting	(2,767)	(5,547)
Net amounts presented in the balance sheet	17,927	3,986
Interest Rate Swaps [Member]
Asset Derivatives [Abstracts]
Gross amounts	1,860	2,139
Effects of netting	(1,860)	(2,139)
Net amounts presented in the balance sheet	$ 0	$ 0

Fair value, after offset of derivative liability, of 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, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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