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Warranties (Tables)
 3 Months Ended
Apr. 30, 2017
Product Warranties Disclosures [Abstract]  
Warranties
Changes in the warranty accrual were as follows:
 
 
Three Months Ended
 
 
April 30,
2017
 
April 30,
2016
Beginning balance
 
$
1,547

 
$
1,835

Accrual for warranties
 
1,377

 
824

Settlements made
 
(519
)
 
(343
)
Ending balance
 
$
2,405

 
$
2,316