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Investments Cost-method Investments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended 6 Months Ended
Sep. 23, 2012
Sep. 25, 2011
Unit
Sep. 23, 2012
Sep. 25, 2011
Sep. 23, 2012
Cost-method Investments [Member]
Mar. 27, 2011
Cost-method Investments [Member]
Indeed.com [Member]
Jun. 24, 2012
Cost-method Investments [Member]
Fenway Sports Group [Member]
Unit
Mar. 25, 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   390         210 100  
Proceeds from sale of investments   $ 117,000         $ 63,000 $ 30,000  
Gain on sale of investments 0 65,273 55,645 71,171   5,898 37,797 17,848 55,645
Impairment of investments $ 600 $ 0 $ 5,500 $ 0 $ 5,500