CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Allowance for Doubtful Accounts Receivable, Current	$ 2,030	$ 1,930
Costs and estimated earnings on long-term contracts, progress billings	64,099	31,129
Advance payments on long-term contracts, costs incurred	$ 59,772	$ 35,266
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	30,468,824	30,364,183
Treasury stock, shares	4,635,622	4,647,322