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Costs and Estimated Earnings in Excess of Billings (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 24, 2015
Jul. 26, 2014
Contractors [Abstract]    
Costs incurred on contracts in progress $ 203,204dy_CostsIncurredOnContractsInProgress $ 234,766dy_CostsIncurredOnContractsInProgress
Estimated to date earnings 49,677dy_EstimatedEarningsLossNetOnContractsInProgress 57,335dy_EstimatedEarningsLossNetOnContractsInProgress
Total costs and estimated earnings 252,881us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear 292,101us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear
Less: billings to date (56,989)us-gaap_BillingsInExcessOfCostCurrent (75,414)us-gaap_BillingsInExcessOfCostCurrent
Total costs in excess of billings 195,892us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms 216,687us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms
Costs and estimated earnings in excess of billings 212,314dy_CostsAndEstimatedEarningsInExcessOfBillings 230,569dy_CostsAndEstimatedEarningsInExcessOfBillings
Billings in excess of costs and estimated earnings (16,422)dy_BillingsInExcessOfCostsAndEstimatedEarnings (13,882)dy_BillingsInExcessOfCostsAndEstimatedEarnings
Total costs in excess of billings $ 195,892us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms $ 216,687us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms