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Warranties (Tables)
 6 Months Ended
Jul. 31, 2018
Product Warranties Disclosures [Abstract]  
Warranties Changes in the warranty accrual were as follows:
 
Three Months Ended
 
Six Months Ended
 
July 31,
2018
 
July 31,
2017
 
July 31,
2018
 
July 31,
2017
Beginning balance
$
1,097

 
$
2,405

 
$
1,163

 
$
1,547

Change in provision
329

 
401

 
486

 
1,778

Settlements made
(289
)
 
(541
)
 
(512
)
 
(1,060
)
Ending balance
$
1,137

 
$
2,265

 
$
1,137

 
$
2,265