Annual report pursuant to Section 13 and 15(d)

Postretirement Health Care and Life Insurance Benefits (Weighted Average Assumptions Used To Determine Net Periodic Costs For Postretirement Plans) (Details)

v2.4.0.6
Postretirement Health Care and Life Insurance Benefits (Weighted Average Assumptions Used To Determine Net Periodic Costs For Postretirement Plans) (Details) (Postretirement Obligations)
12 Months Ended
Jan. 28, 2012
Jan. 29, 2011
Jan. 30, 2010
Postretirement Obligations
     
Discount rate 5.40% 5.65% 7.45%