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Shareholders' equity Summary of Restricted Stock and RSU Awards (Detail) (Restricted Stock and Restricted Stock Units, USD $)
12 Months Ended
Dec. 29, 2013
Dec. 30, 2012
Dec. 25, 2011
Restricted Stock and Restricted Stock Units
     
Shares      
Outstanding and unvested at beginning of year 4,069,509 3,731,033 4,421,437
Granted 1,588,628 1,937,512 175,023
Settled (1,035,256) (997,584) (469,634)
Canceled (428,896) (601,452) (395,793)
Outstanding and unvested at beginning of year 4,193,985 4,069,509 3,731,033
Weighted average fair value      
Outstanding and unvested at beginning of year $ 12.98 $ 10.73 $ 12.19
Granted $ 15.80 $ 12.33 $ 13.21
Settled $ 13.95 $ 3.29 $ 33.51
Canceled $ 13.40 $ 11.95 $ 11.94
Outstanding and unvested at end of year $ 13.92 $ 12.98 $ 10.73