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Product Warranty Costs
 3 Months Ended
Apr. 30, 2011
Product Warranty Costs [Abstract]  
Product Warranty Costs [Text Block]
Product Warranty Costs
Accruals necessary for product warranties are estimated based on historical warranty costs and average time elapsed between purchases and returns for each division. Additional accruals are made for any significant, discrete warranty issues. Changes in the warranty accrual were as follows:
 
 
 
 
 
Three Months Ended
 
 
 
 
 
April 30,

2011
 
April 30,

2010
Balance, beginning of period
 
 
 
 
$
1,437
 
 
$
1,259
 
Accrual for warranties
 
 
 
 
807
 
 
734
 
Settlements made (in cash or in kind)
 
 
 
 
(613
)
 
(380
)
Balance, end of period
 
 
 
 
$
1,631
 
 
$
1,613