Retirement Plans (Periodic Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Pension Plan [Member]
Components of Net Cost
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	281	304	813	912
Expected return on plan assets	(348)	(342)	(1,162)	(1,026)
Plan settlement	22	0	341	0
Amortization of prior service cost	0	0	0	0
Recognized net actuarial (gain) loss	171	179	351	537
Benefit cost	126	141	343	423
VIP Retirement Plan [Member]
Components of Net Cost
Service cost	0	0	0	0
Interest cost	89	89	267	267
Expected return on plan assets	0	0	0	0
Plan settlement	0	0	0	0
Amortization of prior service cost	0	0	0	0
Recognized net actuarial (gain) loss	82	60	246	180
Benefit cost	$ 171	$ 149	$ 513	$ 447