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Warranties (Tables)
 9 Months Ended
Oct. 31, 2017
Product Warranties Disclosures [Abstract]  
Warranties Changes in the warranty accrual were as follows:
 
Three Months Ended
 
Nine Months Ended
 
October 31,
2017
 
October 31,
2016
 
October 31,
2017
 
October 31,
2016
Beginning balance
$
2,265

 
$
2,076

 
$
1,547

 
$
1,835

Change in provision
(274
)
 
202

 
1,504

 
1,288

Settlements made
(774
)
 
(426
)
 
(1,834
)
 
(1,271
)
Ending balance
$
1,217

 
$
1,852

 
$
1,217

 
$
1,852