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Warranties (Tables)
3 Months Ended
Apr. 30, 2018
Product Warranties Disclosures [Abstract]  
Warranties Changes in the warranty accrual were as follows:
 
Three Months Ended
 
April 30,
2018
 
April 30,
2017
Beginning balance
$
1,163

 
$
1,547

Change in provision
157

 
1,377

Settlements made
(223
)
 
(519
)
Ending balance
$
1,097

 
$
2,405