Property, Plant, and Equipment, Net - Capitalized Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Capitalized Interest [Roll Forward]
Capitalized interest, net at beginning of year	$ 2,929	$ 0
Interest capitalized to property, plant, and equipment, net	2,960	2,003
Interest capitalized to investments in unconsolidated affiliates	0	953
Capitalized interest depreciated or amortized	(123)	(27)
Capitalized interest, net at end of year	$ 5,766	$ 2,929