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Costs and Estimated Earnings in Excess of Billings (Details) (USD $)
In Thousands, unless otherwise specified
Jul. 26, 2014
Jul. 27, 2013
Contractors [Abstract]    
Costs incurred on contracts in progress $ 234,766 $ 208,250
Estimated to date earnings 57,335 49,150
Total costs and estimated earnings 292,101 257,400
Less: billings to date (75,414) (66,839)
Total costs in excess of billings 216,687 190,561
Costs and estimated earnings in excess of billings 230,569 204,349
Billings in excess of costs and estimated earnings $ (13,882) $ (13,788)