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Product Warranty Costs
 6 Months Ended
Jul. 31, 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
 
Six Months Ended
 
July 31,

2011
 
July 31,

2010
 
July 31,

2011
 
July 31,

2010
Balance, beginning of period
$
1,631


 
$
1,613


 
$
1,437


 
$
1,259


Accrual for warranties
781


 
711


 
1,588


 
1,445


Settlements made (in cash or in kind)
(770
)
 
(512
)
 
(1,383
)
 
(892
)
Balance, end of period
$
1,642


 
$
1,812


 
$
1,642


 
$
1,812