Investments (Narrative) (Details) (USD $)	3 Months Ended	6 Months Ended
Jun. 25, 2011	Jun. 26, 2010	Jun. 25, 2011	Jun. 26, 2010	Dec. 29, 2010	Dec. 25, 2010
Investments
Workers' compensation self-insurance reserves					$ 170,000,000
Total realized gains on sales of AFS securities	13,476,000	7,126,000	22,736,000	15,749,000
Total realized losses on sales and of AFS securities	949,000	299,000	2,176,000	664,000
OTTI losses on AFS securities	0	0	0	0
Number of investment issues contributing to the total unrealized loss	206		206
Total Unrealized Losses	$ 7,988,000		$ 7,988,000			$ 13,552,000

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This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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This item represents the gross unrealized 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 amount of loss recognized for other than temporary impairments (OTTI) of investments in debt and equity securities.

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The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale 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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Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

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