Retirement Plans (Periodic Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Components of Net Cost
Plan settlement			$ 319	$ 0
Pension Plan [Member]
Components of Net Cost
Service cost	$ 0	$ 0	0	0
Interest cost	266	304	532	608
Expected return on plan assets	(407)	(342)	(814)	(684)
Plan settlement	319	0	319	0
Amortization of prior service cost	0	0	0	0
Recognized net actuarial (gain) loss	91	179	181	358
Benefit cost	269	141	218	282
VIP Retirement Plan [Member]
Components of Net Cost
Service cost	0	0	0	0
Interest cost	89	89	178	178
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	164	120
Benefit cost	$ 171	$ 149	$ 342	$ 298