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Supplemental Cash Flow Information (Details) (USD $)
Share data in Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 25, 2010
Dec. 26, 2009
Supplemental Cash Flow Information [Abstract]      
Interest $ 30,847,000 $ 25,531,000 $ 22,202,000
Income taxes 173,318,000 145,758,000 170,024,000
Debt assumed as part of acquisitions 16,700,000 286,300,000 3,700,000
Interest rate on redeemed convertible contingent notes (in hundredths)   3.00%  
Amount of cash paid in debt conversion   240,000,000  
Number of shares of common stock given in redemption of convertible notes (in shares)   732  
Non-cash net unrealized losses related to hedging activities 700,000 1,100,000 11,500,000
Exchanged note receivable from D4D for equity securities in D4D     $ 7,600,000