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Inventories - Net Inventories (Detail) (USD $)	Mar. 31, 2015	Sep. 30, 2014
Inventory, Net [Abstract]
Raw materials	$ 6,707,000	$ 6,097,000
Work in process	1,957,000	2,414,000
Finished goods	4,449,000	4,988,000
Used equipment	238,000genc_InventoryUsedEquipment	174,000genc_InventoryUsedEquipment
Inventories, net	$ 13,351,000us-gaap_InventoryNet	$ 13,673,000us-gaap_InventoryNet

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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