Employee Benefit Plans Net Periodic Benefit Costs Weighted Average Assumptions (Details)	12 Months Ended
Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
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	4.75%	4.50%	5.00%
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	5.00%	4.50%	5.00%
Other Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	1.81%	1.25%	1.50%
Rate of Increase in compensation	1.33%	1.00%	1.00%
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	5.00%	4.50%	5.25%

The interest rate used to adjust for the time value of money.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(1)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Expected Long-Term Rate of Return on Plan Assets

-URI http://asc.fasb.org/extlink&oid=6512013

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(3)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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- Definition

Expected rate of compensation increases (for pay-related plans).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(2)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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