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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jan. 24, 2015
Jan. 25, 2014
OPERATING ACTIVITIES:    
Net income $ 30,239us-gaap_NetIncomeLoss $ 15,593us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities, net of acquisitions:    
Depreciation and amortization 46,193us-gaap_DepreciationDepletionAndAmortization 46,987us-gaap_DepreciationDepletionAndAmortization
Bad debt expense, net 327us-gaap_ProvisionForDoubtfulAccounts 498us-gaap_ProvisionForDoubtfulAccounts
Gain on sale of fixed assets (3,182)us-gaap_GainLossOnSaleOfPropertyPlantEquipment (2,435)us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Deferred income tax provision 1,371us-gaap_DeferredIncomeTaxExpenseBenefit 898us-gaap_DeferredIncomeTaxExpenseBenefit
Stock-based compensation 7,554us-gaap_ShareBasedCompensation 7,049us-gaap_ShareBasedCompensation
Amortization of premium on long-term debt (195)us-gaap_AmortizationOfDebtDiscountPremium (181)us-gaap_AmortizationOfDebtDiscountPremium
Amortization of debt issuance costs and other 988us-gaap_AmortizationOfFinancingCosts 940us-gaap_AmortizationOfFinancingCosts
Excess tax benefit from share-based awards (2,426)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (2,297)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Change in operating assets and liabilities:    
Accounts receivable, net 6,955us-gaap_IncreaseDecreaseInAccountsReceivable 20,084us-gaap_IncreaseDecreaseInAccountsReceivable
Costs and estimated earnings in excess of billings, net 20,577us-gaap_IncreaseDecreaseInUnbilledReceivables 30,292us-gaap_IncreaseDecreaseInUnbilledReceivables
Other current assets and inventory 152dy_IncreaseDecreaseInOtherCurrentAssetsAndInventory (13,194)dy_IncreaseDecreaseInOtherCurrentAssetsAndInventory
Other assets (2,926)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets (718)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
Income taxes receivable/payable (9,120)us-gaap_IncreaseDecreaseInIncomeTaxesReceivable (15,513)us-gaap_IncreaseDecreaseInIncomeTaxesReceivable
Accounts payable (11,934)us-gaap_IncreaseDecreaseInAccountsPayable (15,586)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued liabilities, insurance claims, and other liabilities (1,318)us-gaap_IncreaseDecreaseInAccruedLiabilities (4,551)us-gaap_IncreaseDecreaseInAccruedLiabilities
Net cash provided by operating activities 83,255us-gaap_NetCashProvidedByUsedInOperatingActivities 67,866us-gaap_NetCashProvidedByUsedInOperatingActivities
INVESTING ACTIVITIES:    
Cash paid for acquisitions, net of cash acquired (9,821)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Capital expenditures (38,772)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (49,240)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of assets 4,039us-gaap_ProceedsFromSaleOfProductiveAssets 4,964us-gaap_ProceedsFromSaleOfProductiveAssets
Changes in restricted cash (541)us-gaap_IncreaseDecreaseInRestrictedCash (305)us-gaap_IncreaseDecreaseInRestrictedCash
Net cash used in investing activities (45,095)us-gaap_NetCashProvidedByUsedInInvestingActivities (44,581)us-gaap_NetCashProvidedByUsedInInvestingActivities
FINANCING ACTIVITIES:    
Proceeds from borrowings on senior Credit Agreement 175,000us-gaap_ProceedsFromLongTermLinesOfCredit 221,000us-gaap_ProceedsFromLongTermLinesOfCredit
Principal payments on senior Credit Agreement, including Term Loan (198,688)us-gaap_RepaymentsOfLongTermLinesOfCredit (247,125)us-gaap_RepaymentsOfLongTermLinesOfCredit
Repurchases of common stock (17,147)us-gaap_PaymentsForRepurchaseOfCommonStock (9,999)us-gaap_PaymentsForRepurchaseOfCommonStock
Exercise of stock options 2,335us-gaap_ProceedsFromStockOptionsExercised 11,869us-gaap_ProceedsFromStockOptionsExercised
Restricted stock tax withholdings (4,330)dy_RestrictedStockRepurchasedForTaxWithholdings (3,590)dy_RestrictedStockRepurchasedForTaxWithholdings
Excess tax benefit from share-based awards 2,426us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 2,297us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Net cash used in financing activities (40,404)us-gaap_NetCashProvidedByUsedInFinancingActivities (25,548)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net decrease in cash and equivalents (2,244)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (2,263)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD 20,672us-gaap_CashAndCashEquivalentsAtCarryingValue 18,607us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH AND EQUIVALENTS AT END OF PERIOD 18,428us-gaap_CashAndCashEquivalentsAtCarryingValue 16,344us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid during the period for:    
Interest 12,769us-gaap_InterestPaid 12,972us-gaap_InterestPaid
Income taxes 28,136us-gaap_IncomeTaxesPaid 25,517us-gaap_IncomeTaxesPaid
Purchases of capital assets included in accounts payable or other accrued liabilities at period end $ 2,577us-gaap_CapitalExpendituresIncurredButNotYetPaid $ 4,461us-gaap_CapitalExpendituresIncurredButNotYetPaid