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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 19,027	$ 20,515	$ 39,910	$ 35,989
Fixed wing aircraft
Disaggregation of Revenue [Line Items]
Revenue	14,381	10,080	27,226	20,019
Rotorcraft
Disaggregation of Revenue [Line Items]
Revenue	2,929	4,197	6,324	7,347
Commercial space
Disaggregation of Revenue [Line Items]
Revenue	593	4,027	3,041	5,360
Energy components for power generation units
Disaggregation of Revenue [Line Items]
Revenue	686	442	1,713	1,055
Commercial product and other revenue
Disaggregation of Revenue [Line Items]
Revenue	438	1,769	1,606	2,208
Commercial revenue
Disaggregation of Revenue [Line Items]
Revenue	8,321	11,348	19,477	19,010
Military revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 10,706	$ 9,167	$ 20,433	$ 16,979

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