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Warranties (Tables)
3 Months Ended
Apr. 30, 2019
Product Warranties Disclosures [Abstract]  
Warranties Changes in the warranty accrual were as follows:
 
Three Months Ended
 
April 30,
2019
 
April 30,
2018
Beginning balance
$
890

 
$
1,163

Change in provision
822

 
157

Settlements made
(321
)
 
(223
)
Ending balance
$
1,391

 
$
1,097