Inventory - Schedule of Components of Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Inventory Disclosure [Abstract]
Purchased parts and raw materials	$ 16,260	$ 14,530
Work-in-process	4,865	3,074
Finished goods	5,055	3,942
Inventory, gross	26,180	21,546
Excess and obsolete reserves	(4,105)	(4,269)
Inventory	$ 22,075	$ 17,277

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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