Uncompleted Contracts - Gross and Net Amounts of Uncompleted Contracts (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Jun. 30, 2015
Disclosure Customer Contracts Additional Information [Abstract]
Costs incurred and estimated earnings recognized on uncompleted contracts	$ 1,937,286	$ 1,633,780
Billings on uncompleted contracts	1,969,683	1,644,413
Total	(32,397)	(10,633)
Shown on balance sheet as:
Costs and estimated earnings in excess of billings on uncompleted contracts	81,743	86,071
Billings on uncompleted contracts in excess of costs and estimated earnings	114,140	96,704
Total	$ (32,397)	$ (10,633)