Summary of Significant Accounting Policies - Concentration Risk (Details)	3 Months Ended		9 Months Ended
	Dec. 31, 2021 item customer	Dec. 31, 2020 item	Dec. 31, 2021 customer item
Concentration of Credit Risk
Number of banks for maintenance of cash balances	2		2
Revenues Net | Customer Concentration Risk
Concentrations
Number of major customers | customer	2		3
Revenues Net | Customer Concentration Risk | Sierra Nevada Corporation
Concentrations
Concentration of risk (as a percent)		17.00%
Revenues Net | Customer Concentration Risk | Amazon.con, Inc
Concentrations
Concentration of risk (as a percent)		12.00%
Revenues Net | Customer Concentration Risk | Pilatus Aircraft Ltd ("Pilatus")
Concentrations
Concentration of risk (as a percent)	24.00%
Revenues Net | Customer Concentration Risk | Textron Aviation, Inc
Concentrations
Concentration of risk (as a percent)		11.00%
Revenues Net | Customer Concentration Risk | Air Transport Services Group
Concentrations
Concentration of risk (as a percent)	25.00%
Inventory | Supplier Concentration Risk
Concentrations
Number of major suppliers	2	2