Employee Postretirement Benefits Employee Postretirement Benefits (Tables)

9 Months Ended

Oct. 31, 2019

Retirement Benefits [Abstract]

Components of net periodic benefit cost for postretirement plan

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

	Three Months Ended				Nine Months Ended
	October 31, 2019		October 31, 2018		October 31, 2019		October 31, 2018
Service cost	$	7	$	7	$	21	$	21
Interest cost	83		79		250		237
Amortization of actuarial losses	24		32		72		96
Amortization of unrecognized gains in prior service cost	(40)		(40)		(120)		(120)
Net periodic benefit cost	$	74	$	78	$	223	$	234