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Uncompleted Contracts (Tables)
 3 Months Ended
Sep. 30, 2017
Disclosure Customer Contracts Additional Information [Abstract]  
Gross and Net Amount of Uncompleted Contracts
Gross and net amounts on uncompleted contracts are as follows: 
 
September 30,
2017
 
June 30,
2017
 
(in thousands)
Costs incurred and estimated earnings recognized on uncompleted contracts
$
1,451,623

 
$
1,919,054

Billings on uncompleted contracts
1,451,229

 
1,903,001

 
$
394

 
$
16,053

Shown in balance sheet as:
 
 
 
Costs and estimated earnings in excess of billings on uncompleted contracts
$
65,953

 
$
91,180

Billings on uncompleted contracts in excess of costs and estimated earnings
65,559

 
75,127

 
$
394

 
$
16,053