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Summary of Significant Accounting Policies - Concentrations (Details)	3 Months Ended		9 Months Ended
	Jun. 30, 2025 item customer	Jun. 30, 2024 item customer	Jun. 30, 2025 customer item	Jun. 30, 2024 customer item
Concentration of Credit Risk
Number of banks for maintenance of cash balances	2		2
Customer Concentration Risk | Revenues Net
Concentrations
Number of major customers | customer	1	2	1	1
Supplier Concentration Risk | Inventory
Concentrations
Number of major suppliers	2	2	1	1
Lockheed Martin Corporation | Customer Concentration Risk | Revenues Net
Concentrations
Concentration of risk (as a percent)	52.00%		47.00%
Pilatus Aircraft Ltd | Customer Concentration Risk | Revenues Net
Concentrations
Concentration of risk (as a percent)		21.00%		26.00%
Lufthansa Technik AG | Customer Concentration Risk | Revenues Net
Concentrations
Concentration of risk (as a percent)		10.00%

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