Retirement Plans (Periodic Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Pension Plan [Member]
Components of Net Cost
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	296	324	592	648
Expected return on plan assets	(284)	(324)	(568)	(648)
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	282	375	564	750
Benefit cost	294	375	588	750
VIP Retirement Plan [Member]
Components of Net Cost
Service cost	0	0	0	0
Interest cost	90	105	180	210
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	77	120	154	240
Benefit cost	167	225	334	450
Non-Employee Directors Retirement Plan [Member]
Components of Net Cost
Service cost	0	0	0	0
Interest cost	3	3	6	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	(29)	0	(58)	0
Benefit cost	$ (26)	$ 3	$ (52)	$ 6