Employee Postretirement Benefits (Tables)

6 Months Ended

Jul. 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				Six Months Ended
	July 31, 2013		July 31, 2012		July 31, 2013		July 31, 2012
Service cost	$	51	$	47	$	101	$	94
Interest cost	87		84		174		168
Amortization of actuarial losses	45		58		91		116
Net periodic benefit cost	$	183	$	189	$	366	$	378