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Warranties (Tables)
 3 Months Ended
Apr. 30, 2016
Product Warranties Disclosures [Abstract]  
Warranties
Changes in the warranty accrual were as follows:
 
Three Months Ended
 
April 30,
2016
 
April 30,
2015
Beginning balance
$
1,835

 
$
3,120

Accrual for warranties
824

 
359

Settlements made
(343
)
 
(1,194
)
Ending balance
$
2,316

 
$
2,285