Retirement Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011
Pension Plan
Net periodic pension costs (income)
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	325	360	975	1,080
Expected return on plan assets	(245)	(289)	(735)	(867)
Amortization of prior service cost	0	0	0	0
Settlement cost	0	1,435	0	1,435
Recognized net actuarial loss or (gain)	360	262	1,080	786
Net periodic pension cost (income)	440	1,768	1,320	2,434
VIP Retirement Plan
Net periodic pension costs (income)
Service cost	0	0	0	0
Interest cost	88	95	264	285
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Settlement cost	0	0	0	0
Recognized net actuarial loss or (gain)	51	13	153	39
Net periodic pension cost (income)	139	108	417	324
Non-Employee Directors Retirement Plan
Net periodic pension costs (income)
Service cost	0	0	0	0
Interest cost	5	6	15	18
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Settlement cost	0	0	0	0
Recognized net actuarial loss or (gain)	0	(10)	0	(30)
Net periodic pension cost (income)	$ 5	$ (4)	$ 15	$ (12)