Retirement Plans (Periodic Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Pension Plan [Member]
Components of Net Cost
Service cost	$ 0	$ 0
Interest cost	266	304
Expected return on plan assets	(407)	(342)
Amortization of transition amount	0	0
Recognized (gain) loss due to curtailments	0	0
Amortization of prior service cost	0	0
Recognized net actuarial (gain) loss	90	179
Benefit cost	(51)	141
VIP Retirement Plan [Member]
Components of Net Cost
Service cost	0	0
Interest cost	89	89
Expected return on plan assets	0	0
Amortization of transition amount	0	0
Recognized (gain) loss due to curtailments	0	0
Amortization of prior service cost	0	0
Recognized net actuarial (gain) loss	82	60
Benefit cost	$ 171	$ 149