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Revenue - Summary of Net Sales Disaggregated by Customer Type (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Disaggregation Of Revenue [Line Items]    
Net sales $ 69,666 $ 146,549
Wholesale    
Disaggregation Of Revenue [Line Items]    
Net sales 52,910 115,161
Direct to consumer    
Disaggregation Of Revenue [Line Items]    
Net sales 16,304 30,356
After-sales service    
Disaggregation Of Revenue [Line Items]    
Net sales $ 452 $ 1,032