CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Sep. 30, 2015
Costs and estimated earnings on long-term contracts, progress billings	$ 45,239	$ 25,309
Property, plant and equipment, net of accumulated depreciation	80,791	76,727
Intangible assets, net of accumulated amortization	51,881	46,292
Advance payments on long-term contracts, costs incurred	$ 36,749	$ 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	30,358,864	30,358,864
Treasury stock, shares	4,622,497	4,542,214