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Property and Equipment (Details) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Apr. 25, 2015 | Apr. 26, 2014 | Apr. 25, 2015 | Apr. 26, 2014 | Jul. 26, 2014
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, plant and equipment, gross | $ 614,702,000us-gaap_PropertyPlantAndEquipmentGross |  | $ 614,702,000us-gaap_PropertyPlantAndEquipmentGross |  | $ 558,710,000us-gaap_PropertyPlantAndEquipmentGross
Less: accumulated depreciation | (388,374,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment |  | (388,374,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment |  | (353,297,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net | 226,328,000us-gaap_PropertyPlantAndEquipmentNet |  | 226,328,000us-gaap_PropertyPlantAndEquipmentNet |  | 205,413,000us-gaap_PropertyPlantAndEquipmentNet
Depreciation expense | 19,800,000us-gaap_Depreciation | 18,600,000us-gaap_Depreciation | 57,800,000us-gaap_Depreciation | 55,700,000us-gaap_Depreciation |
Land |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, plant and equipment, gross | 3,408,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember |  | 3,408,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember |  | 3,408,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember
Buildings |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, plant and equipment, gross | 11,655,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember |  | 11,655,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember |  | 11,589,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember
Leasehold improvements |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, plant and equipment, gross | 6,950,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember |  | 6,950,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember |  | 5,335,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember
Vehicles |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, plant and equipment, gross | 308,887,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember |  | 308,887,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember |  | 279,631,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember
Computer hardware and software |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, plant and equipment, gross | 84,235,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = dy_ComputerHardwareAndSoftwareMember |  | 84,235,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = dy_ComputerHardwareAndSoftwareMember |  | 73,349,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = dy_ComputerHardwareAndSoftwareMember
Office furniture and equipment |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, plant and equipment, gross | 8,244,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember |  | 8,244,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember |  | 7,790,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember
Equipment and machinery |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, plant and equipment, gross | $ 191,323,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember |  | $ 191,323,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember |  | $ 177,608,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember
Minimum | Buildings |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated Useful Lives |  |  | 10 years |  |
Minimum | Leasehold improvements |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated Useful Lives |  |  | 1 year |  |
Minimum | Vehicles |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated Useful Lives |  |  | 1 year |  |
Minimum | Computer hardware and software |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated Useful Lives |  |  | 3 years |  |
Minimum | Office furniture and equipment |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated Useful Lives |  |  | 2 years |  |
Minimum | Equipment and machinery |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated Useful Lives |  |  | 1 year |  |
Maximum | Buildings |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated Useful Lives |  |  | 35 years |  |
Maximum | Leasehold improvements |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated Useful Lives |  |  | 10 years |  |
Maximum | Vehicles |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated Useful Lives |  |  | 5 years |  |
Maximum | Computer hardware and software |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated Useful Lives |  |  | 10 years |  |
Maximum | Office furniture and equipment |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated Useful Lives |  |  | 7 years |  |
Maximum | Equipment and machinery |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated Useful Lives |  |  | 10 years |  |

X
- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + 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 (c) -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 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + 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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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services 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 -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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