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Other (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended9 Months Ended
Sep. 25, 2011
Mar. 27, 2011
Sep. 26, 2010
Sep. 25, 2011
Sep. 26, 2010
Equity method investments     
Proceeds from sale of investments   $ 115,258$ 13,605
Gain on sale of investments65,2735,898071,1719,128
Severance costs3,000  5,700 
Severance liability8,000  8,000 
Fenway Sports Group [Member]
     
Equity method investments     
Units sold in Fenway Sports Group390    
Units owned of Fenway Sports Group before sale700    
Proceeds from sale of investments117,000    
Gain on sale of investments$ 65,273    
Units owned of Fenway Sports Group after sale310    
Equity Method Investment, Ownership Percentage7.30%  7.30%