Retirement Plans (Periodic Pension Cost) (Details) - Pension Plan [Member] - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
Components of Net Cost
Service cost	$ 0	$ 0
Interest cost	298	281
Expected return on plan assets	(237)	(218)
Plan settlement	0	0
Amortization of prior service cost	0	0
Recognized net actuarial loss	134	443
Benefit cost	$ 195	$ 506