Customer Contracts (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Gross and net amount of uncompleted contracts
Costs and estimated earnings recognized on uncompleted contracts	$ 1,919,054	$ 1,875,014
Billings on uncompleted contracts	1,903,001	1,829,340
Total	16,053	45,674
Shown on balance sheet as:
Costs and estimated earnings in excess of billings on uncompleted contracts	91,180	104,001
Billings on uncompleted contracts in excess of costs and estimated earnings	75,127	58,327
Total	$ 16,053	$ 45,674