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Concentration of Business (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2019
USD ($)
supplier
tannery
Mar. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
supplier
tannery
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
supplier
tannery
Sep. 30, 2018
USD ($)
Concentration Risk [Line Items]            
Net sales     $ 542,205 $ 501,913 $ 819,044 $ 752,507
Number of tanneries | tannery 2   2   2  
Number of suppliers | supplier 2   2   2  
Long-lived assets $ 212,323 $ 213,796 $ 212,323   $ 212,323  
Sales Revenue, Net | International net sales            
Concentration Risk [Line Items]            
Net sales     $ 184,234 $ 190,320 $ 293,778 $ 299,207
Concentration risk (as a percent)     34.00% 37.90% 35.90% 39.80%
Sales Revenue, Net | Net sales in foreign currencies            
Concentration Risk [Line Items]            
Net sales     $ 159,059 $ 162,587 $ 218,416 $ 227,013
Concentration risk (as a percent)     29.30% 32.40% 26.70% 30.20%
Sales Revenue, Net | Customer Concentration Risk            
Concentration Risk [Line Items]            
Concentration risk (as a percent)     36.60% 36.60% 30.40% 31.60%
Accounts Receivable | Customer Concentration Risk            
Concentration Risk [Line Items]            
Concentration risk (as a percent) 11.80% 0.00%        
US            
Concentration Risk [Line Items]            
Long-lived assets $ 196,598 $ 196,702 $ 196,598   $ 196,598  
Foreign            
Concentration Risk [Line Items]            
Long-lived assets $ 15,725 $ 17,094 $ 15,725   $ 15,725