Inventories - Net Inventories (Detail) - USD ($)	Sep. 30, 2019	Sep. 30, 2018
Inventory, Net [Abstract]
Raw materials	$ 14,158,000	$ 13,470,000
Work in process	1,397,000	1,247,000
Finished goods	9,811,000	7,157,000
Used equipment		16,000
Inventories, net	$ 25,366,000	$ 21,890,000	[1]

[1] The amounts as of September 30, 2018 have been adjusted to reflect the change in inventory accounting method, as described in Notes 1 and 2 to the Consolidated Financial Statements.