XML 63 R51.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Accrued Insurance Claims (Details) | Apr. 29, 2017 USD ($) state | Jul. 30, 2016 USD ($)
--- | --- | ---
Accrued Insurance Claims [Line Items] |  |
Number of States with State-Sponsored Insurance Fund | state | 2 |
Aggregate stop loss coverage for automobile liability, general liability, and workers' compensation claims before adjustment | $ 103,700,000 |
Insurance liability, annual retained risk loss | 400,000 |
Accrued Insurance | 101,000,000 | $ 89,700,000
Accrued insurance claims, Noncurrent | 60,726,000 | 52,835,000
Maximum |  |
Accrued Insurance Claims [Line Items] |  |
Retained risk of loss, general liability and workers' compensation, maximum automobile liability | 1,000,000 |
Other Noncurrent Assets [Member] |  |
Accrued Insurance Claims [Line Items] |  |
Insurance recoveries/receivables related to accrued claims | $ 8,900,000 | $ 5,700,000

X
- Definition Accrued Insurance Claims [Line Items] + References No definition available. + Details
Name: | dy_AccruedInsuranceClaimsLineItems
Namespace Prefix: | dy_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | dy_AccruedInsuranceClaimsNoncurrent
Namespace Prefix: | dy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Aggregate Stop Loss Coverage for Automobile Liability, General Liability, and Workers' Compensation Claims Before Adjustment Increase + References No definition available. + Details
Name: | dy_AggregateStopLossCoverageforAutomobileLiabilityGeneralLiabilityandWorkersCompensationClaimsBeforeAdjustmentIncrease
Namespace Prefix: | dy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The maximum retained risk of loss per occurrence for automobile liability. + References No definition available. + Details
Name: | dy_AutomobileInsuranceLiabilityGeneralLiabilityAndWorkersCompensation
Namespace Prefix: | dy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Annual retained risk of loss under the employee health plan. + References No definition available. + Details
Name: | dy_InsuranceLiabilityAnnualRetainedRiskOfLossUnderEmployeeHealthPlanPerParticipant
Namespace Prefix: | dy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of States with State-Sponsored Insurance Fund + References No definition available. + Details
Name: | dy_NumberofStateswithStateSponsoredInsuranceFund
Namespace Prefix: | dy_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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 3: 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(20)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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 210.7-03(a)(15)(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_AccruedInsuranceCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. + References No definition available. + Details
Name: | us-gaap_InsuranceSettlementsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherNoncurrentAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |