Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 87,022	$ 83,902
Transferred over Time | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of concentration risk	46.00%	56.00%
North America
Disaggregation of Revenue [Line Items]
Revenue	$ 66,067	$ 68,333
Europe
Disaggregation of Revenue [Line Items]
Revenue	20,955	15,569
Fixed wing aircraft
Disaggregation of Revenue [Line Items]
Revenue	40,094	39,474
Rotorcraft
Disaggregation of Revenue [Line Items]
Revenue	16,369	15,602
Energy components for power generation units
Disaggregation of Revenue [Line Items]
Revenue	23,033	17,396
Commercial product and other revenue
Disaggregation of Revenue [Line Items]
Revenue	7,526	11,430
Commercial revenue
Disaggregation of Revenue [Line Items]
Revenue	48,358	39,786
Military revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 38,664	$ 44,116