Employee Benefit Plans Net Periodic Benefit Costs Weighted Average Assumptions (Details)	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Expected Return on Plan Assets	7.50%	7.50%	7.50%
Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	3.75%	4.75%	4.50%
Rate of Increase in compensation	2.75%	2.75%	2.75%
Excess Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Rate of Increase in compensation	4.25%	4.25%	4.25%
SRIP [Member]
Defined Benefit Plan Disclosure [Line Items]
Rate of Increase in compensation	7.25%	7.25%	7.25%
Excess/SRIP [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	3.75%	5.00%	4.50%
Other Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	1.71%	1.81%	1.25%
Rate of Increase in compensation	1.56%	1.33%	1.00%
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	3.50%	5.00%	4.50%