Financial Instruments - Additional Information (Detail)	6 Months Ended
	Jul. 28, 2012
Diesel Fuel Contracts, Second Half Of Fiscal 2013
Derivative Instruments, Gain (Loss) [Line Items]
Hedge of diesel fuel requirement	50.00%
Diesel Fuel Contracts, First Half Of Fiscal 2014
Derivative Instruments, Gain (Loss) [Line Items]
Hedge of diesel fuel requirement	32.00%