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Concentration of Business (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2018
USD ($)
supplier
tannery
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
supplier
tannery
Sep. 30, 2017
USD ($)
Mar. 31, 2018
USD ($)
Concentration Risk [Line Items]          
Net sales $ 501,913 $ 482,460 $ 752,507 $ 692,177  
Number of tanneries | tannery 2   2    
Number of suppliers | supplier 2   2    
Long-lived assets $ 215,720   $ 215,720   $ 220,162
Sales Revenue, Net | International Net Sales          
Concentration Risk [Line Items]          
Net sales $ 190,320 $ 179,783 $ 299,207 $ 268,787  
Concentration risk (as a percent) 37.90% 37.30% 39.80% 38.80%  
Sales Revenue, Net | Net Sales in Foreign Currencies          
Concentration Risk [Line Items]          
Net sales $ 162,587 $ 160,195 $ 227,013 $ 209,427  
Concentration risk (as a percent) 32.40% 33.20% 30.20% 30.30%  
Sales Revenue, Net | Customer Concentration Risk          
Concentration Risk [Line Items]          
Concentration risk (as a percent) 29.20% 32.10% 24.40% 26.80%  
Accounts Receivable | Customer Concentration Risk          
Concentration Risk [Line Items]          
Concentration risk (as a percent)       21.60%  
US          
Concentration Risk [Line Items]          
Long-lived assets $ 199,192   $ 199,192   203,956
All other countries          
Concentration Risk [Line Items]          
Long-lived assets $ 16,528   $ 16,528   $ 16,206