Employee Postretirement Benefits Employee Postretirement Benefits (Tables)

3 Months Ended

Apr. 30, 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
	April 30, 2019			April 30, 2018
Service cost	$	7		$	7
Interest cost	83			79
Amortization of actuarial losses	24			32
Amortization of unrecognized gains in prior service cost	(40		)	(40		)
Net periodic benefit cost	$	74		$	78