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Goodwill and Intangible Assets (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 25, 2015 | Apr. 25, 2015 | Apr. 26, 2014 | Jul. 26, 2014 | Oct. 25, 2014 | Jan. 24, 2015
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill | $ 269,465,000us-gaap_Goodwill | $ 269,465,000us-gaap_Goodwill |  | 269,088,000us-gaap_Goodwill |  |
Amortization expense for finite-lived intangible assets | 4,100,000us-gaap_AmortizationOfIntangibleAssets | 12,400,000us-gaap_AmortizationOfIntangibleAssets | 14,100,000us-gaap_AmortizationOfIntangibleAssets |  |  |
Goodwill |  |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Reporting units as a percent of consolidated goodwill balance |  |  |  | 20.00%dy_FairValueAssumptionsQualitativeAssessmentsAssetPercent / us-gaap_FairValueByAssetClassAxis = us-gaap_GoodwillMember |  |
Discount rate |  |  |  | 11.50%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = us-gaap_GoodwillMember |  |
Fair value assumptions, expected term |  |  |  | 7 years |  |
Minimum | Goodwill |  |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Terminal growth rate range |  |  |  | 1.50%dy_FairValueAssumptionsTerminalGrowthRate / us-gaap_FairValueByAssetClassAxis = us-gaap_GoodwillMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Maximum | Goodwill |  |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Terminal growth rate range |  |  |  | 3.00%dy_FairValueAssumptionsTerminalGrowthRate / us-gaap_FairValueByAssetClassAxis = us-gaap_GoodwillMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Businesses Acquired in Fiscal 2013 |  |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Number of Reporting Units that Exceeded Carrying Value |  |  |  | 3dy_NumberofReportingUnitsthatExceededCarryingValue / us-gaap_BusinessAcquisitionAxis = dy_BusinessesAcquiredinFiscal2013Member |  |
Excess carrying value, percent |  |  |  | 25.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount / us-gaap_BusinessAcquisitionAxis = dy_BusinessesAcquiredinFiscal2013Member |  |
First Reporting Unit Acquired in Fiscal 2013 |  |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | 10,600,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dy_BusinessOneAcquiredinFiscal2013Member |  |
Second Reporting Unit Acquired in Fiscal 2013 |  |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | 4,800,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dy_BusinessTwoAcquiredinFiscal2013Member |  |
Third Reporting Unit Acquired in Fiscal 2013 |  |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | 3,600,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dy_BusinessThreeAcquiredinFiscal2013Member |  |
Hewitt Power & Communications, Inc |  |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Carrying amount |  |  |  |  | 5,900,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = dy_HewittPowerCommunicationsIncMember |
Customer relationships |  |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Carrying amount | 179,859,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 179,859,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | 173,594,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | 400,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Customer relationships | Hewitt Power & Communications, Inc |  |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Carrying amount | 5,900,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = dy_HewittPowerCommunicationsIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 5,900,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = dy_HewittPowerCommunicationsIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |  |
Contract backlog |  |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Carrying amount | 8,076,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember | 8,076,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember |  | 15,285,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember |  |
Contract backlog | Hewitt Power & Communications, Inc |  |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Carrying amount | $ 7,200,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = dy_HewittPowerCommunicationsIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember | $ 7,200,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = dy_HewittPowerCommunicationsIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember |  |  |  |

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