Employee Postretirement Benefits Employee Postretirement Benefits (Tables)

3 Months Ended

Apr. 30, 2016

Compensation and Retirement Disclosure [Abstract]

Components of net periodic benefit cost for postretirement plan

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

	Three Months Ended
	April 30, 2016			April 30, 2015
Service cost	$	20		$	108
Interest cost	83			105
Amortization of actuarial losses	37			84
Amortization of unrecognized prior service cost	(40		)	—
Net periodic benefit cost	$	100		$	297