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Warranties (Tables)
3 Months Ended
Apr. 30, 2020
Product Warranties Disclosures [Abstract]  
Warranties Changes in the warranty accrual were as follows:
Three Months Ended
April 30,
2020
April 30,
2019
Beginning balance$2,019  $890  
Change in provision
390  822  
Settlements made
(803) (321) 
Ending balance$1,606  $1,391