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Cost and Estimated Earnings in Excess of Billings (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Sep. 30, 2013
Cost And Estimated Earnings In Excess Of Billings [Line Items]    
Cumulative contract revenues earned to date $ 171,238 $ 109,565
Less contract billings to date (171,238) (97,165)
Costs and estimated earnings in excess of billings   $ 12,400