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Costs and Estimated Earnings in Excess of Billings (Details) (USD $) In Thousands, unless otherwise specified	Apr. 25, 2015	Jul. 26, 2014
Contractors [Abstract]
Costs incurred on contracts in progress	$ 228,683dy_CostsIncurredOnContractsInProgress	$ 234,766dy_CostsIncurredOnContractsInProgress
Estimated to date earnings	65,324	57,335
Total costs and estimated earnings	294,007	292,101
Less: billings to date	(60,299)us-gaap_BillingsInExcessOfCostCurrent	(75,414)us-gaap_BillingsInExcessOfCostCurrent
Total costs in excess of billings	233,708	216,687
Costs and estimated earnings in excess of billings	247,979	230,569
Billings in excess of costs and estimated earnings	(14,271)	(13,882)
Total costs in excess of billings	$ 233,708	$ 216,687

Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date.

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- Definition

Amount of receivable reflecting the cost incurred on uncompleted contracts in excess of related billings.

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