XML 46 R45.htm IDEA: XBRL DOCUMENT v2.4.1.9

Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 24, 2015	Jan. 25, 2014	Jan. 24, 2015	Jan. 25, 2014	Jul. 26, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 586,561us-gaap_PropertyPlantAndEquipmentGross		$ 586,561us-gaap_PropertyPlantAndEquipmentGross		$ 558,710us-gaap_PropertyPlantAndEquipmentGross
Less: accumulated depreciation	(379,413)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment		(379,413)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment		(353,297)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net	207,148us-gaap_PropertyPlantAndEquipmentNet		207,148us-gaap_PropertyPlantAndEquipmentNet		205,413us-gaap_PropertyPlantAndEquipmentNet
Depreciation expense	19,131us-gaap_Depreciation	18,657us-gaap_Depreciation	37,972us-gaap_Depreciation	37,058us-gaap_Depreciation
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,408us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember		3,408us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember		3,408us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	11,642us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember		11,642us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember		11,589us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	6,216us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember		6,216us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember		5,335us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	293,176us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember		293,176us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember		279,631us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	80,563us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = dy_ComputerHardwareAndSoftwareMember		80,563us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = dy_ComputerHardwareAndSoftwareMember		73,349us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = dy_ComputerHardwareAndSoftwareMember
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,928us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember		7,928us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember		7,790us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember
Equipment and machinery
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 183,628us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember		$ 183,628us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember		$ 177,608us-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)

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-Section S99

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 14

-Article 5

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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

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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

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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

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-Topic 360

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-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229



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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.

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