Retirement Plans (Periodic Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Pension Plan [Member]
Components of Net Cost
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	304	296	912	888
Expected return on plan assets	(342)	(284)	(1,026)	(852)
Amortization of transition amount	0	0	0	0
Recognized (gain) loss due to curtailments	0	0	0	0
Amortization of prior service cost	0	0	0	0
Recognized net actuarial (gain) loss	179	282	537	846
Benefit cost	141	294	423	882
VIP Retirement Plan [Member]
Components of Net Cost
Service cost	0	0	0	0
Interest cost	89	90	267	270
Expected return on plan assets	0	0	0	0
Amortization of transition amount	0	0	0	0
Recognized (gain) loss due to curtailments	0	0	0	0
Amortization of prior service cost	0	0	0	0
Recognized net actuarial (gain) loss	60	77	180	231
Benefit cost	149	167	447	501
Non-Employee Directors Retirement Plan [Member]
Components of Net Cost
Service cost	0	0		0
Interest cost	9	3	27	9
Expected return on plan assets	0	0	0	0
Amortization of transition amount	0	0	0	0
Recognized (gain) loss due to curtailments	0	0	0	0
Amortization of prior service cost	0	0	0	0
Recognized net actuarial (gain) loss	0	(29)	0	(87)
Benefit cost	$ 9	$ (26)	$ 27	$ (78)