Employee Postretirement Benefits Employee Postretirement Benefits (Details) - Other Postretirement Benefit Plans, Defined Benefit [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 20	$ 49	$ 60	$ 265
Interest cost	83	92	249	302
Amortization of actuarial losses	36	38	110	206
Amortization of unrecognized prior service cost (Credit)	(40)	0	(120)	0
Defined Benefit Plan, Net Periodic Benefit Cost	$ 99	$ 179	$ 299	$ 773