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Schedule of Derivative Instruments by Income Statement Location (Parenthetical) (Detail) (Commodity Contracts - Fuel)
12 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Dec. 25, 2010
Cost of goods sold and occupancy costs
     
Derivative Instruments, Gain (Loss) [Line Items]      
Percentage of derivative loss recognized in earnings 60.00% 60.00% 60.00%
Operating and selling expenses
     
Derivative Instruments, Gain (Loss) [Line Items]      
Percentage of derivative loss recognized in earnings 40.00% 40.00% 40.00%