CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Sep. 30, 2015
Costs and estimated earnings on long-term contracts, progress billings	$ 49,305	$ 25,309
Property, plant and equipment, net of accumulated depreciation	78,476	76,727
Intangible assets, net of accumulated amortization	48,986	46,292
Advance payments on long-term contracts, costs incurred	$ 35,519	$ 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	4,538,614	4,542,214