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Retirement Plans (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2012
Jul. 31, 2011
Pension Plan [Member]
       
Net periodic pension costs (income)        
Service cost            
Interest cost 325 360 650 720
Expected return on plan assets (245) (289) (490) (578)
Amortization of prior service cost            
Recognized net actuarial loss or (gain) 360 262 720 524
Net periodic pension cost (income) 440 333 880 666
VIP Retirement Plan [Member]
       
Net periodic pension costs (income)        
Service cost            
Interest cost 88 95 176 190
Expected return on plan assets            
Amortization of prior service cost            
Recognized net actuarial loss or (gain) 51 13 102 26
Net periodic pension cost (income) 139 108 278 216
Non-Employee Directors Retirement Plan [Member]
       
Net periodic pension costs (income)        
Service cost            
Interest cost 5 6 10 12
Expected return on plan assets            
Amortization of prior service cost            
Recognized net actuarial loss or (gain)   (10)   (20)
Net periodic pension cost (income) $ 5 $ (4) $ 10 $ (8)