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Costs and Estimated Earnings in Excess of Billings (Details) (USD $)
In Thousands, unless otherwise specified
Oct. 25, 2014
Jul. 26, 2014
Contractors [Abstract]    
Costs incurred on contracts in progress $ 232,709 $ 234,766
Estimated to date earnings 61,859 57,335
Total costs and estimated earnings 294,568 292,101
Less: billings to date (51,644) (75,414)
Total costs in excess of billings 242,924 216,687
Costs and estimated earnings in excess of billings 256,951 230,569
Billings in excess of costs and estimated earnings (14,027) (13,882)
Total costs in excess of billings $ 242,924 $ 216,687