Customer Contracts (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2015
Gross and net amount of uncompleted contracts
Costs and estimated earnings recognized on uncompleted contracts	$ 1,875,014	$ 1,633,780
Billings on uncompleted contracts	1,829,340	1,644,413
Total	45,674	(10,633)
Shown on balance sheet as:
Costs and estimated earnings in excess of billings on uncompleted contracts	104,001	86,071
Billings on uncompleted contracts in excess of costs and estimated earnings	58,327	96,704
Total	$ 45,674	$ (10,633)