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Concentration of Business (Details)
$ in Thousands
3 Months Ended
Jun. 30, 2018
USD ($)
supplier
tannery
Jun. 30, 2017
USD ($)
Mar. 31, 2018
USD ($)
Concentration Risk [Line Items]      
Number of tanneries | tannery 2    
Number of suppliers | supplier 2    
Long-lived assets $ 217,653   $ 220,162
International Net Sales      
Concentration Risk [Line Items]      
Concentration risk (as a percent) 43.50% 42.40%  
Sales Revenue, Net | Customer Concentration Risk      
Concentration Risk [Line Items]      
Concentration risk (as a percent) 20.50% 19.90%  
Accounts Receivable | Customer Concentration Risk      
Concentration Risk [Line Items]      
Concentration risk (as a percent) 25.80% 21.60%  
US      
Concentration Risk [Line Items]      
Long-lived assets $ 203,029   203,956
All other countries      
Concentration Risk [Line Items]      
Revenue $ 64,426 $ 49,233  
Concentration risk (as a percent) 25.70% 23.50%  
Long-lived assets $ 14,624   $ 16,206