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Uncompleted Contracts - Gross and Net Amounts of Uncompleted Contracts (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014
Disclosure Customer Contracts Additional Information [Abstract]
Costs incurred and estimated earnings recognized on uncompleted contracts	$ 1,659,874	$ 1,435,242
Billings on uncompleted contracts	1,673,763	1,470,674
Total	(13,889)	(35,432)
Shown on balance sheet as:
Costs and estimated earnings in excess of billings on uncompleted contracts	89,819	73,008
Billings on uncompleted contracts in excess of costs and estimated earnings	103,708	108,440
Total	$ (13,889)	$ (35,432)

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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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Amount of receivable reflecting the cost incurred on uncompleted contracts in excess of related billings.

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Amount of receivable reflecting the cost incurred on uncompleted contracts in excess of related billings which is expected to be collected within one year or the normal operating cycle, if longer.

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