Inventory - Narratives (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Inventory [Line Items]
Write-down on inventory	$ 535	$ 0	$ 535	$ 0
Inventory to be sold	9,500		$ 9,500
Commercial Jet Engines And Parts
Inventory [Line Items]
Write-down on inventory	$ 500