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Employee Retirement Benefits
6 Months Ended
Jul. 31, 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
 
Six Months Ended
 
July 31,

2011
 
July 31,

2010
 
July 31,

2011
 
July 31,

2010
Service cost
$
30


 
$
15


 
$
60


 
$
31


Interest cost
84


 
81


 
168


 
162


Amortization of actuarial losses
31


 
42


 
63


 
83


Net periodic benefit cost
$
145


 
$
138


 
$
291


 
$
276