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Employee Retirement Benefits
3 Months Ended
Apr. 30, 2011
Employee Retirement Benefits [Abstract]  
Employee Retirement Benefits [Text Block]
Employee Retirement Benefits
The components of net periodic benefit cost for postretirement benefits are as follows:
 
 
 
 
 
Three Months Ended
 
 
 
 
 
April 30,

2011
 
April 30,

2010
Service cost
 
 
 
 
$
30
 
 
$
15
 
Interest cost
 
 
 
 
84
 
 
81
 
Amortization of actuarial losses
 
 
 
 
32
 
 
42
 
Net periodic benefit cost
 
 
 
 
$
146
 
 
$
138