Retirement Plans (Periodic Pension Cost) (Details) - Pension Plan [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Components of Net Cost
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	280	301	561	602
Expected return on plan assets	(218)	(224)	(436)	(448)
Plan settlement	220	0	220	0
Amortization of prior service cost	0	0	0	0
Recognized net actuarial loss	442	465	885	930
Benefit cost	$ 724	$ 542	$ 1,230	$ 1,084