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Costs and Estimated Earnings in Excess of Billings (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 26, 2014
Jul. 27, 2013
Contractors [Abstract]    
Costs incurred on contracts in progress $ 197,659 $ 208,250
Estimated to date earnings 45,831 49,150
Total costs and estimated earnings 243,490 257,400
Less: billings to date (58,310) (66,839)
Total costs in excess of billings 185,180 190,561
Costs and estimated earnings in excess of billings 198,581 204,349
Billings in excess of costs and estimated earnings $ (13,401) $ (13,788)