Inventories, Net - Write-Downs (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Inventory [Line Items]
Inventory write-downs	$ 7,758	$ 3,888
LCM
Inventory [Line Items]
Inventory write-downs	6,051	3,888
Obsolescence
Inventory [Line Items]
Inventory write-downs	$ 1,707	$ 0