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Uncompleted Contracts - Gross and Net Amounts of Uncompleted Contracts (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Jun. 30, 2015
Disclosure Customer Contracts Additional Information [Abstract]
Costs incurred and estimated earnings recognized on uncompleted contracts	$ 1,744,572	$ 1,633,780
Billings on uncompleted contracts	1,736,243	1,644,413
Total	8,329	(10,633)
Shown on balance sheet as:
Costs and estimated earnings in excess of billings on uncompleted contracts	83,604	86,071
Billings on uncompleted contracts in excess of costs and estimated earnings	75,275	96,704
Total	$ 8,329	$ (10,633)

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Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method.

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