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Financial Instruments - Additional Information (Detail)
6 Months Ended
Aug. 02, 2014
Diesel Fuel Contracts Remainder Of Fiscal Year Two Thousand Fifteen
 
Derivative Instruments, Gain (Loss) [Line Items]  
Hedge of diesel fuel requirement 50.00%
Diesel Fuel Contracts, First Three Months Of Fiscal Year Two Thousand Sixteen
 
Derivative Instruments, Gain (Loss) [Line Items]  
Hedge of diesel fuel requirement 17.00%