Summary of Significant Accounting Policies - Schedule of Property, Plant and Equipment by Major Asset Class (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 83,677	$ 88,480
Less: Accumulated depreciation	61,883	62,219
Property, plant and equipment, net	21,794	26,261
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	469	469
Buildings
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	13,167	13,514
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 70,041	$ 74,497