Employee Postretirement Benefits (Tables)

3 Months Ended

Apr. 30, 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
	April 30, 2013		April 30, 2012
Service cost	$	50	$	47
Interest cost	87		84
Amortization of actuarial losses	46		58
Net periodic benefit cost	$	183	$	189