CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Sep. 30, 2012
Costs and estimated earnings on long-term contracts, progress billings	$ 21,089	$ 30,534
Property, plant and equipment, net of accumulated depreciation	65,832	61,344
Intangible assets, net of accumulated amortization	13,831	11,690
Advance payments on long-term contracts, costs incurred	$ 32,716	$ 31,534
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	30,147,504	30,044,486
Treasury stock, shares	3,711,007	3,453,249