Supplemental income statement information related to leases (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Supplemental income statement information related to leases [Line Items]
Operating Lease, Cost	[1]	$ 5,685	$ 4,655	$ 10,786	$ 9,259
Cost of goods sold [Member]
Supplemental income statement information related to leases [Line Items]
Operating Lease, Cost		3,219	2,591	6,130	5,209
Selling, General and Administrative Expenses [Member]
Supplemental income statement information related to leases [Line Items]
Operating Lease, Cost		$ 2,466	$ 2,064	$ 4,656	$ 4,050

[1] Includes variable operating lease costs.