Inventories - Net Inventories (Detail) - USD ($)	Dec. 31, 2015	Sep. 30, 2015
Inventory, Net [Abstract]
Raw materials	$ 7,933,000	$ 6,090,000
Work in process	2,554,000	1,849,000
Finished goods	4,305,000	4,563,000
Used equipment	279,000	268,000
Inventories, net	$ 15,071,000	$ 12,770,000