Retirement Plans (Periodic Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Pension Plan [Member]
Components of Net Cost
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	304	296	608	592
Expected return on plan assets	(342)	(284)	(684)	(568)
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	358	564
Benefit cost	141	294	282	588
VIP Retirement Plan [Member]
Components of Net Cost
Service cost	0	0	0	0
Interest cost	89	90	178	180
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	120	154
Benefit cost	149	167	298	334
Non-Employee Directors Retirement Plan [Member]
Components of Net Cost
Service cost	0	0		0
Interest cost	9	3	18	6
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	(58)
Benefit cost	$ 9	$ (26)	$ 18	$ (52)