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Inventories - Net Inventories (Detail) (USD $)
Dec. 31, 2014
Sep. 30, 2014
Inventory, Net [Abstract]    
Raw materials $ 5,837,000us-gaap_InventoryRawMaterialsNetOfReserves $ 6,097,000us-gaap_InventoryRawMaterialsNetOfReserves
Work in process 2,149,000us-gaap_InventoryWorkInProcessNetOfReserves 2,414,000us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 5,150,000us-gaap_InventoryFinishedGoodsNetOfReserves 4,988,000us-gaap_InventoryFinishedGoodsNetOfReserves
Used equipment 168,000genc_InventoryUsedEquipment 174,000genc_InventoryUsedEquipment
Inventories, net $ 13,304,000us-gaap_InventoryNet $ 13,673,000us-gaap_InventoryNet