Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Deferred tax assets:
Net U.S. operating loss carryforwards	$ 6,166	$ 3,833
Net non-U.S. operating loss carryforwards	1,023	637
Employee benefits	1,514	1,761
Inventory reserves	1,045	897
Allowance for doubtful accounts	33	45
Intangibles	1,223	1,621
Foreign tax credits	1,724	1,724
Other tax credits	1,684	1,514
Other	1,171	1,216
Total deferred tax assets	15,583	13,248
Deferred tax liabilities:
Depreciation	(7,298)	(7,948)
Prepaid expenses	(286)	(359)
Other	(419)	(458)
Total deferred tax liabilities	(8,003)	(8,765)
Net deferred tax assets	7,580	4,483
Valuation allowance	(7,717)	(4,641)
Net deferred tax liabilities	$ (137)	$ (158)