Employee Benefit Plans Projected Benefit Obligation, Plan Assets and Accumulated Benefit Obligation (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	$ 406,045	$ 397,430
Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation	693,350	501,178
Fair Value of Plan Assets	406,045	397,430
Funded Status	(287,305)	(103,748)
Accumulated Benefit Obligation	620,632	450,255
Excess/SRIP [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation	133,136	99,380
Fair Value of Plan Assets	0	0
Funded Status	(133,136)	(99,380)
Accumulated Benefit Obligation	97,425	70,847
Other Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation	15,214	15,312
Fair Value of Plan Assets	0	0
Funded Status	(15,214)	(15,312)
Accumulated Benefit Obligation	12,590	12,814
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation	841,700	615,870	631,538
Fair Value of Plan Assets	406,045	397,430	331,181
Funded Status	(435,655)	(218,440)
Accumulated Benefit Obligation	$ 730,647	$ 533,916

For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Accumulated Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6503844

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

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- Definition

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

+ 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 (a)

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

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

-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6522206

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Accumulated Postretirement Benefit Obligation

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- Definition

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

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- Definition

The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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