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Warranties (Tables)
9 Months Ended
Oct. 31, 2019
Product Warranties Disclosures [Abstract]  
Warranties Changes in the warranty accrual were as follows:
Three Months EndedNine Months Ended
October 31,
2019
October 31,
2018
October 31,
2019
October 31,
2018
Beginning balance$1,739  $1,137  $890  $1,163  
Change in provision
1,184  521  3,038  1,007  
Settlements made
(939) (807) (1,944) (1,319) 
Ending balance$1,984  $851  $1,984  $851