Employee Benefit Plans Estimated Pre-Tax Amount to be Amortized from Accumulated Other Comprehensive Loss into Net Periodic Benefit Cost Over Next 12 Months (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2015
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	$ 29,690
Prior service cost (credit)	(7)
Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year	29,683
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	1,590
Prior service cost (credit)	(687)
Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year	$ 903