Employee Postretirement Benefits (Tables)

6 Months Ended

Jul. 31, 2014

Compensation and Retirement Disclosure [Abstract]

Components of net periodic benefit cost for postretirement benefits

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

	Three Months Ended				Six Months Ended
	July 31, 2014		July 31, 2013		July 31, 2014		July 31, 2013
Service cost	$	49	$	51	$	98	$	101
Interest cost	92		87		183		174
Amortization of actuarial losses	38		45		76		91
Net periodic benefit cost	$	179	$	183	$	357	$	366