Retirement Plans (Periodic Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Pension Plan [Member]
Components of Net Cost
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	296	324	888	972
Expected return on plan assets	(284)	(324)	(852)	(972)
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	846	1,125
Benefit cost	294	375	882	1,125
VIP Retirement Plan [Member]
Components of Net Cost
Service cost	0	0	0	0
Interest cost	90	105	270	315
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	231	360
Benefit cost	167	225	501	675
Non-Employee Directors Retirement Plan [Member]
Components of Net Cost
Service cost	0	0	0	0
Interest cost	3	3	9	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	(29)	0	(87)	0
Benefit cost	$ (26)	$ 3	$ (78)	$ 9