Employee Postretirement Benefits (Tables)

3 Months Ended

Apr. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Components of net periodic benefit cost for postretirement plan

The components of net periodic benefit cost for postretirement benefits are as follows:

	Three Months Ended
	April 30, 2015		April 30, 2014
Service cost	$	108	$	49
Interest cost	105		91
Amortization of actuarial losses	84		38
Net periodic benefit cost	$	297	$	178