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Other Comprehensive Earnings (Tables)
3 Months Ended
Apr. 01, 2012
Other Comprehensive Earnings (Thousands of Dollars) [Abstract]  
Schedule of comprehensive earnings (loss)
 
Pension and Postretirement Amounts
Gains (Losses) on Derivative Instruments
Foreign Currency Translation Adjustments
Total Accumulated Other Comprehensive Earnings (Loss)
2012
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Balance at Dec. 25, 2011
$   (86,822)
10,081 
40,798 
(35,943)
Current period other comprehensive earnings (loss)
 
 
(10,553)
 
22,266 
 
11,713 
 
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Balance at April 1, 2012
$   (86,822)
(472)
63,064 
(24,230)
 
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2011
       
Balance at Dec. 26, 2010
$   (69,925)
15,432 
62,642 
8,149 
Current period other comprehensive earnings (loss)
 
 
(38,581)
 
28,669 
 
(9,912)
 
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Balance at March 27, 2011
$   (69,925)
(23,149)
91,311 
(1,763)
 
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