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Customer Contracts (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Jun. 30, 2011
Gross and net amount of uncompleted contracts
Costs incurred and estimated earnings recognized on uncompleted contracts	$ 774,749	$ 583,334
Billings on uncompleted contracts	736,480	578,763
Total	38,269	4,571
Shown on balance sheet as:
Costs and estimated earnings in excess of billings on uncompleted contracts	68,562	40,056
Billings on uncompleted contracts in excess of costs and estimated earnings	30,293	35,485
Total	$ 38,269	$ 4,571

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