Retirement Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Director Providing Service To Company			10 years
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	$ 0	$ 0	$ 0	$ 0
Defined Benefit Plan, Interest Cost	322	325	644	650
Defined Benefit Plan, Expected Return on Plan Assets	(276)	(245)	(552)	(490)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0	0	0
Restructuring, Settlement and Impairment Provisions	0	0	0	0
Net periodic pension costs (income)
Defined Benefit Plan, Amortization of Gains (Losses)	350	360	700	720
Defined Benefit Plan, Net Periodic Benefit Cost	396	440	792	880
VIP Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	0	0	0	0
Defined Benefit Plan, Interest Cost	83	88	166	176
Defined Benefit Plan, Expected Return on Plan Assets	0	0	0	0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0	0	0
Restructuring, Settlement and Impairment Provisions	0	0	0	0
Net periodic pension costs (income)
Defined Benefit Plan, Amortization of Gains (Losses)	55	51	110	102
Defined Benefit Plan, Net Periodic Benefit Cost	138	139	276	278
Non-Employee Directors Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	0	0	0	0
Defined Benefit Plan, Interest Cost	4	5	8	10
Defined Benefit Plan, Expected Return on Plan Assets	0	0	0	0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0	0	0
Restructuring, Settlement and Impairment Provisions	0	0	0	0
Net periodic pension costs (income)
Defined Benefit Plan, Amortization of Gains (Losses)	(3)	0	(6)	0
Defined Benefit Plan, Net Periodic Benefit Cost	$ 1	$ 5	$ 2	$ 10