Retirement Plans (Periodic Pension Cost) (Details) - Pension Plan [Member] - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2023	Apr. 30, 2022
Components of Net Cost
Service cost	$ 0	$ 0
Interest cost	360	298
Expected return on plan assets	(199)	(237)
Plan settlement	0	0
Amortization of prior service cost	0	0
Recognized net actuarial loss	0	134
Benefit cost	$ 161	$ 195