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Acquisitions (Details) (USD $) | 3 Months Ended
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Jan. 24, 2015 | Oct. 25, 2014 | Apr. 26, 2014 | Jul. 26, 2014
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 269,465,000 us-gaap_Goodwill |  |  | $ 269,088,000 us-gaap_Goodwill
Property, Plant and Equipment, Gross | 586,561,000 us-gaap_PropertyPlantAndEquipmentGross |  |  | 558,710,000 us-gaap_PropertyPlantAndEquipmentGross
Connect Cable Contractors, Inc. and Systems Communications Services, Inc. [Member] [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition payments | 1,500,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = dy_ConnectCableContractorsInc.andSystemsCommunicationsServicesInc.MemberMember |  |  |
Hewitt Power & Communications, Inc |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition payments |  | 8,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = dy_HewittPowerCommunicationsIncMember |  |
Finite-Lived Intangible Assets, Gross |  | 5,900,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = dy_HewittPowerCommunicationsIncMember |  |
Telecommunications Specialty Construction Contractor, Canada |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition payments |  |  | 700,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = dy_TelecommunicationsSpecialtyConstructionContractorCanadaMember |
Watts Brothers |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition payments |  |  |  | 16,400,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = dy_WattsBrothersCableConstructionInc.Member
Goodwill |  | 1,600,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dy_WattsBrothersCableConstructionInc.Member |  |
Finite-Lived Customer Relationships, Gross |  | 8,500,000 us-gaap_FiniteLivedCustomerRelationshipsGross / us-gaap_BusinessAcquisitionAxis = dy_WattsBrothersCableConstructionInc.Member |  |
Property, Plant and Equipment, Gross |  | $ 3,700,000 us-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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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite 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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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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