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Investments Cost-method Investments (Details) (USD $)
3 Months Ended 9 Months Ended 1 Months Ended 6 Months Ended
Sep. 29, 2013
Sep. 23, 2012
Sep. 29, 2013
Sep. 23, 2012
Sep. 23, 2012
Cost-method Investments [Member]
May 31, 2012
Cost-method Investments [Member]
Fenway Sports Group [Member]
Unit
Feb. 29, 2012
Cost-method Investments [Member]
Fenway Sports Group [Member]
Unit
Jun. 24, 2012
Cost-method Investments [Member]
Fenway Sports Group [Member]
Cost-method Investments                
Units sold in Fenway Sports Group           210 100  
Proceeds from sale of investments           $ 63,000,000 $ 30,000,000  
Gain on sale of investment, pre-tax 0 0 0 55,645,000   37,800,000 17,800,000 55,600,000
Impairment of investments $ 0 $ 600,000 $ 0 $ 5,500,000 $ 5,500,000