CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Sep. 30, 2014
Costs and estimated earnings on long-term contracts, progress billings	$ 14,466	$ 30,041
Property, plant and equipment, net of accumulated depreciation	75,247	70,694
Intangible assets, net of accumulated amortization	43,785	37,402
Advance payments on long-term contracts, costs incurred	$ 36,830	$ 44,110
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	30,356,303	30,247,512
Treasury stock, shares	4,266,062	4,040,532