CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013
Costs and estimated earnings on long-term contracts, progress billings	$ 23,723	$ 30,887
Property, plant and equipment, net of accumulated depreciation	66,542	64,332
Intangible assets, net of accumulated amortization	35,638	33,952
Advance payments on long-term contracts, costs incurred	$ 39,349	$ 23,853
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	30,194,146	30,147,504
Treasury stock, shares	3,703,807	3,707,407