Inventory - Schedule of Components of Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020
Inventory Disclosure [Abstract]
Purchased parts and raw materials	$ 12,824	$ 14,530
Work-in-process	3,593	3,074
Finished goods	4,046	3,942
Inventory, gross	20,463	21,546
Excess and obsolete reserves	(3,847)	(4,269)
Inventory	$ 16,616	$ 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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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount of valuation reserve for inventory.

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

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