Retirement Plans (Periodic Pension Cost) (Details) - Pension Plan [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Components of Net Cost
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	301	355	602	710
Expected return on plan assets	(224)	(343)	(448)	(686)
Plan settlement	0	0	0	0
Amortization of prior service cost	0	0	0	0
Recognized net actuarial loss	465	176	930	352
Benefit cost	$ 542	$ 188	$ 1,084	$ 376