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Shareholders' equity Summary of Stock-Option Awards (Detail) (USD $)
 12 Months Ended
Dec. 29, 2013
Dec. 30, 2012
Dec. 25, 2011
Dec. 26, 2010
Shares        
Outstanding at beginning of year 11,344,018 20,340,291 23,649,290  
Granted 22,558 109,699 1,333,597  
Exercised (1,598,902) (2,716,637) (496,749)  
Canceled/Expired (4,192,273) (6,389,335) (4,145,847)  
Outstanding at end of year 5,575,401 11,344,018 20,340,291 23,649,290
Options exercisable at year end 4,574,619 8,942,897 15,857,692  
Weighted average grant date fair value of options granted during the year $ 8.20 $ 5.43 $ 7.63  
Weighted average exercise price        
Outstanding at beginning of year $ 43.50 $ 47.66 $ 52.08  
Granted $ 20.48 $ 14.33 $ 15.79  
Exercised $ 13.44 $ 9.38 $ 5.71  
Canceled/Expired $ 73.11 $ 70.76 $ 67.61  
Outstanding at end of year $ 29.76 $ 43.50 $ 47.66 $ 52.08
Options exercisable at year end $ 32.85 $ 51.35 $ 57.26  
Weighted average remaining contractual term        
Outstanding at beginning of year 3 years 2 months 12 days 3 years 2 months 12 days 3 years 6 months 2 days 3 years 10 months 29 days
Outstanding at end of year 3 years 2 months 12 days 3 years 2 months 12 days 3 years 6 months 2 days 3 years 10 months 29 days
Options exercisable at year end 2 years 9 months 18 days 2 years 7 months 6 days 2 years 8 months 15 days  
Aggregate intrinsic value        
Outstanding at beginning of year $ 16,902,892 $ 17,184,761 $ 28,819,223  
Outstanding at end of year 46,988,804 16,902,892 17,184,761 28,819,223
Options exercisable at year end $ 33,348,296 $ 8,845,944 $ 10,644,474