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Summary of Significant Accounting Policies - Concentration Risk (Details) | 3 Months Ended | 9 Months Ended
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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 |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13531-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13537-108611 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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