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Revenue - Summary of Net Sales Disaggregated by Customer Type (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jan. 31, 2019
Oct. 31, 2018
Jul. 31, 2018
Apr. 30, 2018
Jan. 31, 2018
Oct. 31, 2017
Jul. 31, 2017
Apr. 30, 2017
Jan. 31, 2019
Jan. 31, 2018
[1]
Jan. 31, 2017
[1]
Disaggregation Of Revenue [Line Items]                      
Net sales $ 199,376 $ 208,949 $ 144,093 $ 127,149 $ 149,214 $ 190,693 $ 128,781 $ 99,265 $ 679,567 [1] $ 567,953 $ 552,752
Wholesale                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 532,565    
Direct to consumer                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 142,439    
After-sales service                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 $ 4,563    
[1] The United States and International net sales are net of intercompany sales of $319.5 million, $268.1 million and $289.2 million for the fiscal years ended January 31, 2019, 2018 and 2017, respectively.