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Accrued Insurance Claims (Details) (USD $) | Jan. 24, 2015 | Jul. 26, 2014 | Jul. 25, 2015
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Accrued Insurance Claims [Line Items] |  |  |
Insurance liability, annual retained risk loss | $ 250,000 dy_InsuranceLiabilityAnnualRetainedRiskOfLossUnderEmployeeHealthPlanPerParticipant |  |
Retained risk of loss per participant for employee health plan for claim amounts that aggregate across all participants in excess of $250,000 | 550,000 dy_InsuranceLiabilityRetainedRiskOfLossPerParticipantEmployeeHealthPlanClaimAmountsThatAggregateAcrossAllParticipants |  |
Health plan participant threshold | 250,000 dy_InsuranceLiabilityRetainedRiskOfLossEmployeeHealthPlanThreshold |  |
Accrued Insurance | 72,500,000 us-gaap_AccruedInsuranceCurrentAndNoncurrent | 66,000,000 us-gaap_AccruedInsuranceCurrentAndNoncurrent |
Accrued insurance claims, Noncurrent | 38,348,000 dy_AccruedInsuranceClaimsNoncurrent | 33,782,000 dy_AccruedInsuranceClaimsNoncurrent |
Scenario, Forecast |  |  |
Accrued Insurance Claims [Line Items] |  |  |
Aggregate stop loss coverage for automobile liability, general liability, and workers' compensation claims before adjustment |  |  | 59,500,000 dy_AggregateStopLossCoverageforAutomobileLiabilityGeneralLiabilityandWorkersCompensationClaimsBeforeAdjustmentIncrease / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember
Maximum |  |  |
Accrued Insurance Claims [Line Items] |  |  |
Retained risk of loss, general liability and workers' compensation, maximum automobile liability | $ 1,000,000 dy_AutomobileInsuranceLiabilityGeneralLiabilityAndWorkersCompensation / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

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- Details
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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable to insurance entities and/or claimants to mitigate potential losses from auto liability, general liability, workers compensation, employee group health, and damage claims. Used to reflect the Noncurrent portion of the liabilities. + References No definition available. + Details
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- Definition Aggregate Stop Loss Coverage for Automobile Liability, General Liability, and Workers' Compensation Claims Before Adjustment Increase + References No definition available. + Details
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- Definition The maximum retained risk of loss per occurrence for automobile liability. + References No definition available. + Details
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- Definition Annual retained risk of loss under the employee health plan. + References No definition available. + Details
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- Definition Threshold for retained risk of loss per participant for employee health plan + References No definition available. + Details
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- Definition Retained risk of loss per participant for employee health plan for claim amounts that aggregate across all participants in excess of $250,000 + References No definition available. + Details
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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable to insurance entities to mitigate potential loss from various risks or to satisfy a promise to provide certain coverage's to employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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