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Capital Transactions - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended
Apr. 29, 2008
Sep. 29, 2013
Stock
Sep. 30, 2012
Sep. 27, 2013
Sep. 28, 2012
Sep. 29, 2013
Common Stock [Member]
Sep. 30, 2012
Common Stock [Member]
Sep. 29, 2013
Common Stock [Member]
Vote
Sep. 30, 2012
Common Stock [Member]
Mar. 05, 2013
Class B Common Stock [Member]
Mar. 06, 2012
Class B Common Stock [Member]
Sep. 29, 2013
Class B Common Stock [Member]
Sep. 30, 2012
Class B Common Stock [Member]
Sep. 29, 2013
Class B Common Stock [Member]
Vote
Sep. 30, 2012
Class B Common Stock [Member]
Apr. 29, 2008
Class B Common Stock [Member]
Apr. 29, 2008
Performance Shares [Member]
Schedule of Capitalization, Equity [Line Items]                                  
Number of common class of stock outstanding   2                              
Dividend is declared and paid on the Common Stock           $ 0.25 $ 0.25 $ 0.75 $ 0.75     $ 0.25 $ 0.25 $ 0.75 $ 0.75    
Number of votes per share               1           20      
Performance units authorized                                 400,000
Common B stock per performance unit                               1  
Term of performance unit award agreement 10 years                                
Performance units granted annually                               40,000  
Maximum goal achievement percentage                               100.00%  
Performance units awarded                   40,000 40,000            
Performance units awards settled in cash                           19,880 17,680    
Increase in total number of shares outstanding                           20,120 22,320    
Performance Unit Award Agreement costs recognized   $ 1.9 $ 2.0                            
Share price       $ 63.36 $ 68.10