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Investments Cost-method Investments (Details) (USD $)	3 Months Ended			1 Months Ended
Investments Cost-method Investments (Details) (USD $)	Mar. 31, 2013	Mar. 25, 2012	Mar. 25, 2012 Cost-method Investments [Member]	Feb. 29, 2012 Cost-method Investments [Member] Fenway Sports Group [Member] Unit
Cost-method Investments
Units Sold In Fenway Sports Group				100
Proceeds from sale of investments				$ 30,000,000
Gain on sale of investment, pre-tax	0	17,848,000		17,800,000
Impairment of investments	$ 0	$ 4,900,000	$ 4,900,000

The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

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- Definition

The net cash paid (received) associated with the acquisition or disposal of all investments, including securities and other assets.

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