Assumptions used to Calculate Net Benefit Cost (Detail)	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Pension Benefits
Schedule of Net Periodic Benefit Costs Weighted Average Assumptions [Line Items]
Discount rate	4.99%	5.25%	6.22%
Rate of compensation increase	3.69%	3.68%	3.67%
Expected long-term rate of return on assets	6.59%	7.22%	7.63%
Postretirement Benefits
Schedule of Net Periodic Benefit Costs Weighted Average Assumptions [Line Items]
Discount rate	4.60%	4.90%	6.20%