Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 21,299	$ 19,247
Revenue from Contract with Customer | Customer Concentration Risk | Transferred over Time
Disaggregation of Revenue [Line Items]
Concentration risk	54.00%	57.00%
North America
Disaggregation of Revenue [Line Items]
Revenue	$ 17,294	$ 15,862
Europe
Disaggregation of Revenue [Line Items]
Revenue	4,005	3,385
Fixed wing aircraft
Disaggregation of Revenue [Line Items]
Revenue	10,726	9,888
Rotorcraft
Disaggregation of Revenue [Line Items]
Revenue	4,380	3,544
Energy components for power generation units
Disaggregation of Revenue [Line Items]
Revenue	4,624	3,657
Commercial product and other revenue
Disaggregation of Revenue [Line Items]
Revenue	1,569	2,158
Commercial revenue
Disaggregation of Revenue [Line Items]
Revenue	10,181	8,360
Military revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 11,118	$ 10,887