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Investments Cost-method Investments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 24, 2012
Jun. 26, 2011
Jun. 24, 2012
Jun. 26, 2011
Mar. 25, 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]
Mar. 25, 2012
Cost-method Investments [Member]
Fenway Sports Group [Member]
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-net of purchases     $ 92,525 $ 5,475     $ 63,000 $ 30,000  
Gain on sale of investments 37,797 0 55,645 5,898   5,898 37,797 17,848 55,645
Impairment of investments $ 0 $ 0 $ 4,900 $ 0 $ 4,900