Retirement Plans and Other Benefits (Assumed Health Care Cost Trend Rates Related to Measurement of SERP Medical Plan Obligations) (Details)	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Medical care | Defined Benefit Obligations
Health Care Cost Trend Rates Assumptions [Line Items]
Initial cost trend rate	7.00%	7.00%	7.00%
Ultimate cost trend rate	5.00%	5.00%	5.00%
Year that the ultimate cost trend rate is reached	2021	2021	2019
Medical care | Net Periodic Benefit Costs
Health Care Cost Trend Rates Assumptions [Line Items]
Initial cost trend rate	7.00%	7.00%	7.00%
Ultimate cost trend rate	5.00%	5.00%	5.00%
Year that the ultimate cost trend rate is reached	2021	2019	2018
Dental care | Defined Benefit Obligations
Health Care Cost Trend Rates Assumptions [Line Items]
Initial cost trend rate	5.00%	5.00%	5.00%
Ultimate cost trend rate	5.00%	5.00%	5.00%
Year that the ultimate cost trend rate is reached	2017	2016	2015
Dental care | Net Periodic Benefit Costs
Health Care Cost Trend Rates Assumptions [Line Items]
Initial cost trend rate	5.00%	5.00%	5.00%
Ultimate cost trend rate	5.00%	5.00%	5.00%
Year that the ultimate cost trend rate is reached	2016	2015	2014