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Warranties (Tables)
 3 Months Ended
Apr. 30, 2014
Product Warranties Disclosures [Abstract]  
Warranties
Changes in the warranty accrual were as follows:
 
 
Three Months Ended
 
 
April 30,
2014
 
April 30,
2013
Beginning balance
 
$
2,525

 
$
1,888

Accrual for warranties
 
741

 
864

Settlements made (in cash or in kind)
 
(612
)
 
(762
)
Ending balance
 
$
2,654

 
$
1,990