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Financial Instruments and Risk Management, Offsetting Derivative Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 27, 2014	Sep. 27, 2014
Liability Derivatives [Abstracts]
Gross amounts	$ 12,343	$ 10,806
Effects of netting	(4,627)	(7,686)
Net amounts presented in the balance sheet	7,716	3,120
Cash collateral	0	0
Commodity-Related Derivatives [Member]
Liability Derivatives [Abstracts]
Gross amounts	9,073	7,127
Effects of netting	(2,767)	(5,547)
Net amounts presented in the balance sheet	6,306	1,580
Interest Rate Swaps [Member]
Liability Derivatives [Abstracts]
Gross amounts	3,270	3,679
Effects of netting	(1,860)	(2,139)
Net amounts presented in the balance sheet	$ 1,410	$ 1,540

Fair value, after offset of derivative asset, of financial liability or 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, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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