Concentration of Business (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($) tannery	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) tannery	Sep. 30, 2020 USD ($)	Mar. 31, 2021 USD ($)
Concentration Risk [Line Items]
Net sales	$ 721,902	$ 623,525	$ 1,226,580	$ 906,694
Number of tanneries | tannery	2		2
Long-lived assets	$ 223,687		$ 223,687		$ 206,210
Trade Accounts Receivable | Customer Concentration Risk | One Customer
Concentration Risk [Line Items]
Concentration risk			12.50%		12.80%
Foreign
Concentration Risk [Line Items]
Long-lived assets	11,670		$ 11,670		$ 11,377
Foreign | International net sales
Concentration Risk [Line Items]
Net sales	207,267	196,113	375,886	294,982
Foreign | Net sales in foreign currencies
Concentration Risk [Line Items]
Net sales	$ 158,548	$ 156,671	$ 247,981	$ 212,354
Foreign | Sales Revenue, Net | International net sales
Concentration Risk [Line Items]
Concentration risk	28.70%	31.50%	30.60%	32.50%
Foreign | Sales Revenue, Net | Net sales in foreign currencies
Concentration Risk [Line Items]
Concentration risk	22.00%	25.10%	20.20%	23.40%
Foreign | Sales Revenue, Net | Customer Concentration Risk | 10 Largest Customers
Concentration Risk [Line Items]
Concentration risk	35.50%	31.90%	31.60%	27.30%
US
Concentration Risk [Line Items]
Long-lived assets	$ 212,017		$ 212,017		$ 194,833