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Uncompleted Contracts - Gross and Net Amounts of Uncompleted Contracts (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Jun. 30, 2016
Disclosure Customer Contracts Additional Information [Abstract]
Costs incurred and estimated earnings recognized on uncompleted contracts	$ 1,266,388	$ 1,875,014
Billings on uncompleted contracts	1,271,826	1,829,340
Total	(5,438)	45,674
Shown on balance sheet as:
Costs and estimated earnings in excess of billings on uncompleted contracts	69,986	104,001
Billings on uncompleted contracts in excess of costs and estimated earnings	75,424	58,327
Total	$ (5,438)	$ 45,674

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