CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015
Allowance for Doubtful Accounts Receivable, Current	$ 1,930	$ 1,563
Costs and estimated earnings on long-term contracts, progress billings	31,129	25,309
Advance payments on long-term contracts, costs incurred	$ 35,266	$ 49,779
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	30,364,183	30,358,864
Treasury stock, shares	4,647,322	4,542,214