Employee Postretirement Benefits (Tables)

6 Months Ended

Jul. 31, 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				Six Months Ended
	July 31, 2015		July 31, 2014		July 31, 2015		July 31, 2014
Service cost	$	108	$	49	$	216	$	98
Interest cost	105		92		210		183
Amortization of actuarial losses	84		38		168		76
Net periodic benefit cost	$	297	$	179	$	594	$	357