Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2016	Jan. 31, 2016	Jul. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Pension Contributions		$ 950
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 821		$ 891
Expected return on plan assets	(864)		(1,142)
Recognized net actuarial net loss	377		310
Net periodic (benefit) cost	334		59
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	3		4
Expected return on plan assets	0		0
Recognized net actuarial net loss	3		3
Net periodic (benefit) cost	$ 6		$ 7