Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 83,902	$ 99,591
Transferred over Time | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of concentration risk	56.00%	65.00%
North America
Disaggregation of Revenue [Line Items]
Revenue	$ 68,333	$ 81,719
Europe
Disaggregation of Revenue [Line Items]
Revenue	15,569	17,872
Fixed wing aircraft
Disaggregation of Revenue [Line Items]
Revenue	39,474	38,474
Rotorcraft
Disaggregation of Revenue [Line Items]
Revenue	15,602	27,214
Energy components for power generation units
Disaggregation of Revenue [Line Items]
Revenue	17,396	20,390
Commercial product and other revenue
Disaggregation of Revenue [Line Items]
Revenue	11,430	13,513
Commercial revenue
Disaggregation of Revenue [Line Items]
Revenue	39,786	36,587
Military revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 44,116	$ 63,004