Employee Postretirement Benefits (Tables)

9 Months Ended

Oct. 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				Nine Months Ended
	October 31, 2014		October 31, 2013		October 31, 2014		October 31, 2013
Service cost	$	49	$	51	$	147	$	152
Interest cost	91		87		274		261
Amortization of actuarial losses	38		45		114		136
Net periodic benefit cost	$	178	$	183	$	535	$	549