Revenue - Summary of Net Sales Disaggregated by Customer Type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Disaggregation Of Revenue [Line Items]
Net sales	$ 88,538	$ 157,816	$ 158,204	$ 304,365
Wholesale
Disaggregation Of Revenue [Line Items]
Net sales	60,462	119,136	113,372	234,297
Direct to consumer
Disaggregation Of Revenue [Line Items]
Net sales	27,688	37,734	43,992	68,090
After-sales service
Disaggregation Of Revenue [Line Items]
Net sales	$ 388	$ 946	$ 840	$ 1,978