Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 84,815	$ 79,633
Fixed wing aircraft
Disaggregation of Revenue [Line Items]
Revenue	51,379	41,847
Rotorcraft
Disaggregation of Revenue [Line Items]
Revenue	17,069	17,255
Commercial space
Disaggregation of Revenue [Line Items]
Revenue	5,029	13,200
Energy components for power generation units
Disaggregation of Revenue [Line Items]
Revenue	2,491	1,821
Commercial products and other revenue
Disaggregation of Revenue [Line Items]
Revenue	8,847	5,510
Commercial revenue
Disaggregation of Revenue [Line Items]
Revenue	36,928	41,759
Military revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 47,887	$ 37,874