Employee Postretirement Benefits Employee Postretirement Benefits (Tables)

9 Months Ended

Oct. 31, 2020

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, 2020		October 31, 2019		October 31, 2020		October 31, 2019
Service cost	$	9	$	7	$	27	$	21
Interest cost	70		83		210		250
Amortization of actuarial losses	43		24		129		72
Amortization of unrecognized gains in prior service cost	(40)		(40)		(120)		(120)
Net periodic benefit cost	$	82	$	74	$	246	$	223