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Acquisitions (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Oct. 25, 2014 | Jan. 24, 2015 business | Apr. 26, 2014 | Jul. 26, 2014 | Apr. 25, 2015
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  |  | $ 269,088,000us-gaap_Goodwill | $ 269,465,000us-gaap_Goodwill
Property, Plant and Equipment, Gross |  |  |  | 558,710,000us-gaap_PropertyPlantAndEquipmentGross | 614,702,000us-gaap_PropertyPlantAndEquipmentGross
Hewitt Power & Communications, Inc |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisition payments | 8,000,000us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = dy_HewittPowerCommunicationsIncMember |  |  |  |
Finite-Lived Intangible Assets, Gross | 5,900,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = dy_HewittPowerCommunicationsIncMember |  |  |  |
Cable Installation Contractors |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisition payments |  | 1,500,000us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = dy_ConnectCableContractorsInc.andSystemsCommunicationsServicesInc.Member |  |  |
Number of businesses acquired |  | 2us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = dy_ConnectCableContractorsInc.andSystemsCommunicationsServicesInc.Member |  |  |
Telecommunications Specialty Construction Contractor, Canada |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisition payments |  |  | 700,000us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = dy_TelecommunicationsSpecialtyConstructionContractorCanadaMember |  |
Watts Brothers |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisition payments |  |  |  | 16,400,000us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = dy_WattsBrothersCableConstructionInc.Member |
Business Acquisition, Cost of Acquired Entity, Cash Paid For Working Capital | 2,600,000dy_BusinessAcquisitionCostOfAcquiredEntityCashPaidForWorkingCapital / us-gaap_BusinessAcquisitionAxis = dy_WattsBrothersCableConstructionInc.Member |  |  |  |
Goodwill | 1,600,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dy_WattsBrothersCableConstructionInc.Member |  |  |  |
Finite-Lived Customer Relationships, Gross | 8,500,000us-gaap_FiniteLivedCustomerRelationshipsGross / us-gaap_BusinessAcquisitionAxis = dy_WattsBrothersCableConstructionInc.Member |  |  |  |
Property, Plant and Equipment, Gross | $ 3,700,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_BusinessAcquisitionAxis = dy_WattsBrothersCableConstructionInc.Member |  |  |  |

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- Definition Gross carrying amount before accumulated amortization as of the balance sheet date to an asset acquired in a business combination representing a favorable existing relationship with customers having a finite beneficial life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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