Concentration of Business (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020 USD ($) tannery	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) tannery	Sep. 30, 2019 USD ($)	Mar. 31, 2020 USD ($)
Concentration Risk [Line Items]
Net sales	$ 623,525	$ 542,205	$ 906,694	$ 819,044
Number of tanneries | tannery	2		2
Long-lived assets	$ 207,912		$ 207,912		$ 209,037
Sales Revenue, Net | International net sales
Concentration Risk [Line Items]
Net sales	$ 196,113	$ 184,234	$ 294,982	$ 293,778
Concentration risk	31.50%	34.00%	32.50%	35.90%
Sales Revenue, Net | Net sales in foreign currencies
Concentration Risk [Line Items]
Net sales	$ 156,671	$ 159,059	$ 212,354	$ 218,416
Concentration risk	25.10%	29.30%	23.40%	26.70%
Sales Revenue, Net | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk	31.90%	36.60%	27.30%	30.40%
US
Concentration Risk [Line Items]
Long-lived assets	$ 194,185		$ 194,185		194,679
Foreign
Concentration Risk [Line Items]
Long-lived assets	$ 13,727		$ 13,727		$ 14,358