Investments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 25, 2012	Mar. 27, 2011
Investments
Proceeds from sale of investments-net of purchases	$ (29,850)	$ (5,595)
Gain on sale of investment	17,848	5,898
Impairment of investments	4,900	0
Unrealized gain on available-for-sale security	7,014	0
Unrealized gain on available-for-sale security, net of taxes	4,109
Fenway Sports Group [Member]
Investments
Units Sold In Fenway Sports Group	100
Proceeds from sale of investments-net of purchases	$ 30,000
Units Owned of Fenway Sports Group After Sale	210
Ownership percentage of Fenway Sports Group	4.97%
Metro Boston LLC [Member]
Investments
Equity Method Investment, Ownership Percentage	49.00%
Donohue Malbaie Inc. [Member]
Investments
Equity Method Investment, Ownership Percentage	49.00%
Madison Paper Industries [Member]
Investments
Equity Method Investment, Ownership Percentage	40.00%
quadrantONE LLC [Member]
Investments
Equity Method Investment, Ownership Percentage	25.00%

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Units Sold In Fenway Sports Group

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The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the sale.

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Percent of net assets at close of period. For schedules of investments that are categorized, each category has a percent of net assets for the aggregated value of the Investments in the category.

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Gross appreciation or the gross loss in value of the total unsold securities. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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Gross appreciation or the gross loss in value of the total of unsold available-for-sale securities during the period being reported (except when designated as a fair value hedge).

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

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