Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
Oct. 01, 2011 statement month	Oct. 02, 2010 month	Dec. 31, 2010 month
Fair value measurements
Other than temporary impairment of auction rate securities	$ 5,140
Temporary decline in market value of auction rate securities	280
Auction rate securities, par value	13,550
Minimum period estimated by the entity for the ARS market to improve (in months)	12	12	12
Fair value measured on a recurring basis \| Total Fair Value
Fair value measurements
Cash and cash equivalents	25,690	58,862	115,976
ARS	8,130	5,960	6,775
Available-for-sale securities excluding ARS	60,802	27,203	27,178
Trading securities	39,031	36,158	38,504
Total assets measured at fair value	133,890	131,136	197,054
Fair value measured on a recurring basis \| Total Fair Value \| Foreign currency forward contracts
Fair value measurements
Derivative instruments, net	(108)	820	942
Fair value measured on a recurring basis \| Total Fair Value \| Commodity futures contracts
Fair value measurements
Derivative instruments, net	345	647	2,310
Fair value measured on a recurring basis \| Total Fair Value \| Commodity option contracts
Fair value measurements
Derivative instruments, net		1,486	5,369
Fair value measured on a recurring basis \| Level 1
Fair value measurements
Cash and cash equivalents	25,690	58,862	115,976
Trading securities	39,031	36,158	38,504
Total assets measured at fair value	65,066	97,153	162,159
Fair value measured on a recurring basis \| Level 1 \| Commodity futures contracts
Fair value measurements
Derivative instruments, net	345	647	2,310
Fair value measured on a recurring basis \| Level 1 \| Commodity option contracts
Fair value measurements
Derivative instruments, net		1,486	5,369
Fair value measured on a recurring basis \| Level 2
Fair value measurements
Available-for-sale securities excluding ARS	60,802	27,203	27,178
Total assets measured at fair value	60,694	28,023	28,120
Fair value measured on a recurring basis \| Level 2 \| Foreign currency forward contracts
Fair value measurements
Derivative instruments, net	(108)	820	942
Fair value measured on a recurring basis \| Level 3
Fair value measurements
ARS	8,130	5,960	6,775
Total assets measured at fair value	$ 8,130	$ 5,960	$ 6,775

This element represents the aggregate of the assets, including derivative assets (liabilities), net, at period end measured at fair value by the entity. For derivative instruments, the fair values as of the balance sheet date are the assets less any liabilities of a derivative or group of derivatives.

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This item represents the fair value of investments in debt and equity securities classified as Available-for-sale Securities, excluding auction rate securities.

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Minumum period estimated by the entity for the securities market to improve.

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The net amount of gross unrealized gains (losses) for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Trading Securities which consist of all investments in certain debt and equity securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected.

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