Financial Instruments - Additional Information (Detail)	9 Months Ended
	Nov. 01, 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 Nine Months Of Fiscal Year Two Thousand Sixteen
Derivative Instruments, Gain (Loss) [Line Items]
Hedge of diesel fuel requirement	37.00%