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Cost and Estimated Earnings in Excess of Billings (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Sep. 30, 2013
Cost And Estimated Earnings In Excess Of Billings [Line Items]    
Contract revenues earned to date $ 164,522 $ 109,565
Less contract billings to date (164,978) (97,165)
Billings in excess of costs and estimated earnings (456)   
Costs and estimated earnings in excess of billings    $ 12,400