XML 62 R59.htm IDEA: XBRL DOCUMENT
v3.19.3

Accrued Insurance Claims - Narratives (Details) | 9 Months Ended
--- | ---
Oct. 26, 2019 USD ($) state
Accrued Insurance Claims [Line Items] |
Insurance Liability, Annual Retained Risk of Loss, Under Employee Health Plan Per Participant, Maximum Threshold | $ 425,000
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 | $ 77,100,000
Insurance liability, annual retained risk loss | 400,000
Decrease in accrued insurance claims | 8,600,000
Maximum |
Accrued Insurance Claims [Line Items] |
Retained risk of loss, general liability and workers' compensation, maximum automobile liability | $ 1,000,000.0

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 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 Insurance Liability, Annual Retained Risk of Loss, Under Employee Health Plan Per Participant, Maximum Threshold + References No definition available. + Details
Name: | dy_InsuranceLiabilityAnnualRetainedRiskofLossUnderEmployeeHealthPlanPerParticipantMaximumThreshold
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 The increase (decrease) in insurance liability balances during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInInsuranceLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |