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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 29,259	$ 21,853	$ 76,854	$ 62,394
North America
Disaggregation of Revenue [Line Items]
Revenue	21,987	15,391	57,975	47,037
Europe
Disaggregation of Revenue [Line Items]
Revenue	7,272	6,462	18,879	15,357
Fixed wing aircraft
Disaggregation of Revenue [Line Items]
Revenue	10,631	8,726	30,650	28,307
Rotorcraft
Disaggregation of Revenue [Line Items]
Revenue	5,470	4,067	12,817	11,960
Energy components for power generation units
Disaggregation of Revenue [Line Items]
Revenue	7,802	7,005	20,462	16,729
Commercial product and other revenue
Disaggregation of Revenue [Line Items]
Revenue	5,356	2,055	12,925	5,398
Commercial revenue
Disaggregation of Revenue [Line Items]
Revenue	19,114	13,086	49,730	34,629
Military revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 10,145	$ 8,767	$ 27,124	$ 27,765

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