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Costs and Estimated Earnings in Excess of Billings (Tables)
 12 Months Ended
Jul. 29, 2017
Contractors [Abstract]  
Costs and Estimated Earnings in Excess of Billings, Net
Costs and estimated earnings in excess of billings (“CIEB”) includes revenue for services performed under contracts using the units-of-delivery method of accounting and the cost-to-cost measure of the percentage of completion method of accounting. Amounts consisted of the following (dollars in thousands):
 
July 29, 2017
 
July 30, 2016
Costs incurred on contracts in progress
$
327,312

 
$
307,826

Estimated to date earnings
92,781

 
92,226

Total costs and estimated earnings
420,093

 
400,052

Less: billings to date
(40,091
)
 
(42,637
)
 
$
380,002

 
$
357,415

Included in the accompanying consolidated balance sheets under the captions:
 

 
 

 Costs and estimated earnings in excess of billings
$
389,286

 
$
376,972

 Billings in excess of costs and estimated earnings
(9,284
)
 
(19,557
)
 
$
380,002

 
$
357,415