Employee Postretirement Benefits (Tables)

9 Months Ended

Oct. 31, 2013

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, 2013		October 31, 2012		October 31, 2013		October 31, 2012
Service cost	$	51	$	46	$	152	$	140
Interest cost	87		84		261		252
Amortization of actuarial losses	45		59		136		175
Net periodic benefit cost	$	183	$	189	$	549	$	567