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Pro Forma Consolidated Results of Operations (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
4 Months Ended
Apr. 20, 2013
Apr. 21, 2012
Acquisition [Abstract]    
Sales, As reported $ 1,130,810 $ 898,206
Sales, Pro forma   948,382
Net income, As reported 113,275 37,943
Net income, Pro forma   $ 38,438
Basic net income per common share, As reported $ 0.82 $ 0.28
Basic net income per common share, Pro forma   $ 0.28
Diluted net income per common share, As reported $ 0.81 $ 0.28
Diluted net income per common share, Pro forma   $ 0.28