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Uncompleted Contracts (Tables)
 6 Months Ended
Dec. 31, 2017
Disclosure Customer Contracts Additional Information [Abstract]  
Gross and Net Amount of Uncompleted Contracts
Gross and net amounts on uncompleted contracts are as follows: 
 
December 31,
2017
 
June 30,
2017
 
(in thousands)
Costs incurred and estimated earnings recognized on uncompleted contracts
$
2,152,981

 
$
1,919,054

Billings on uncompleted contracts
2,155,136

 
1,903,001

 
$
(2,155
)
 
$
16,053

Shown in balance sheet as:
 
 
 
Costs and estimated earnings in excess of billings on uncompleted contracts
$
64,221

 
$
91,180

Billings on uncompleted contracts in excess of costs and estimated earnings
66,376

 
75,127

 
$
(2,155
)
 
$
16,053