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Supplemental Consolidating Financial Statements - Income Statement (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Apr. 25, 2015 | Apr. 26, 2014 | Apr. 25, 2015 | Apr. 26, 2014
Revenues [Abstract] |  |  |  |
Contract revenues | $ 492,363us-gaap_SalesRevenueServicesNet | $ 426,284us-gaap_SalesRevenueServicesNet | $ 1,443,833us-gaap_SalesRevenueServicesNet | $ 1,329,522us-gaap_SalesRevenueServicesNet
EXPENSES: |  |  |  |
Costs of earned revenues, excluding depreciation and amortization | 388,239us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization | 350,352us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization | 1,147,136us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization | 1,087,824us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization
General and administrative | 44,707us-gaap_GeneralAndAdministrativeExpense | 39,162us-gaap_GeneralAndAdministrativeExpense | 131,218us-gaap_GeneralAndAdministrativeExpense | 120,799us-gaap_GeneralAndAdministrativeExpense
Depreciation and amortization | 23,985us-gaap_DepreciationDepletionAndAmortization | 22,726us-gaap_DepreciationDepletionAndAmortization | 70,179us-gaap_DepreciationDepletionAndAmortization | 69,713us-gaap_DepreciationDepletionAndAmortization
Intercompany charges (income), net | 0dy_IntercompanyChargesIncome | 0dy_IntercompanyChargesIncome | 0dy_IntercompanyChargesIncome | 0dy_IntercompanyChargesIncome
Interest expense, net | (6,646)us-gaap_InterestIncomeExpenseNet | (6,563)us-gaap_InterestIncomeExpenseNet | (20,126)us-gaap_InterestIncomeExpenseNet | (20,249)us-gaap_InterestIncomeExpenseNet
Other income, net | 3,471us-gaap_OtherNonoperatingIncomeExpense | 5,593us-gaap_OtherNonoperatingIncomeExpense | 7,001us-gaap_OtherNonoperatingIncomeExpense | 8,200us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes | 32,257us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 13,074us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 82,175us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 39,137us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision (benefit) for income taxes: | 11,999us-gaap_IncomeTaxExpenseBenefit | 5,179us-gaap_IncomeTaxExpenseBenefit | 31,678us-gaap_IncomeTaxExpenseBenefit | 15,649us-gaap_IncomeTaxExpenseBenefit
Net income (loss) before equity in earnings of subsidiaries | 20,258dy_NetIncomeLossBeforeEquityInEarningsOfSubsidiaries | 7,895dy_NetIncomeLossBeforeEquityInEarningsOfSubsidiaries | 50,497dy_NetIncomeLossBeforeEquityInEarningsOfSubsidiaries | 23,488dy_NetIncomeLossBeforeEquityInEarningsOfSubsidiaries
Equity in earnings (losses) of subsidiaries | 0dy_EquityInEarningsOfSubsidiaries | 0dy_EquityInEarningsOfSubsidiaries | 0dy_EquityInEarningsOfSubsidiaries | 0dy_EquityInEarningsOfSubsidiaries
Net income | 20,258us-gaap_NetIncomeLoss | 7,895us-gaap_NetIncomeLoss | 50,497us-gaap_NetIncomeLoss | 23,488us-gaap_NetIncomeLoss
Foreign currency translation gains (losses), net of tax | 38us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent | (46)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent | (688)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent | (332)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
Comprehensive income | 20,296us-gaap_ComprehensiveIncomeNetOfTax | 7,849us-gaap_ComprehensiveIncomeNetOfTax | 49,809us-gaap_ComprehensiveIncomeNetOfTax | 23,156us-gaap_ComprehensiveIncomeNetOfTax
Parent |  |  |  |
Revenues [Abstract] |  |  |  |
Contract revenues | 0us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
EXPENSES: |  |  |  |
Costs of earned revenues, excluding depreciation and amortization | 0us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
General and administrative | 13,249us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 9,878us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 38,056us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 31,398us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Depreciation and amortization | 1,410us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,164us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,953us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,058us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Intercompany charges (income), net | (16,294)dy_IntercompanyChargesIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (12,608)dy_IntercompanyChargesIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (47,124)dy_IntercompanyChargesIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (39,713)dy_IntercompanyChargesIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest expense, net | (1,635)us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,566)us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (5,115)us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (5,260)us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other income, net | 0us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before income taxes | 0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Provision (benefit) for income taxes: | 0us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income (loss) before equity in earnings of subsidiaries | 0dy_NetIncomeLossBeforeEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0dy_NetIncomeLossBeforeEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0dy_NetIncomeLossBeforeEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0dy_NetIncomeLossBeforeEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in earnings (losses) of subsidiaries | 20,258dy_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,895dy_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 50,497dy_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 23,488dy_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income | 20,258us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,895us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 50,497us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 23,488us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Foreign currency translation gains (losses), net of tax | 38us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (46)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (688)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (332)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Comprehensive income | 20,296us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,849us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 49,809us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 23,156us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Issuer |  |  |  |
Revenues [Abstract] |  |  |  |
Contract revenues | 0us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = dy_IssuerMember | 0us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = dy_IssuerMember | 0us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = dy_IssuerMember | 0us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = dy_IssuerMember
EXPENSES: |  |  |  |
Costs of earned revenues, excluding depreciation and amortization | 0us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization / dei_LegalEntityAxis = dy_IssuerMember | 0us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization / dei_LegalEntityAxis = dy_IssuerMember | 0us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization / dei_LegalEntityAxis = dy_IssuerMember | 0us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization / dei_LegalEntityAxis = dy_IssuerMember
General and administrative | 131us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = dy_IssuerMember | 211us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = dy_IssuerMember | 371us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = dy_IssuerMember | 651us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = dy_IssuerMember
Depreciation and amortization | 0us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = dy_IssuerMember | 0us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = dy_IssuerMember | 0us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = dy_IssuerMember | 0us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = dy_IssuerMember
Intercompany charges (income), net | 0dy_IntercompanyChargesIncome / dei_LegalEntityAxis = dy_IssuerMember | 0dy_IntercompanyChargesIncome / dei_LegalEntityAxis = dy_IssuerMember | 0dy_IntercompanyChargesIncome / dei_LegalEntityAxis = dy_IssuerMember | 0dy_IntercompanyChargesIncome / dei_LegalEntityAxis = dy_IssuerMember
Interest expense, net | (5,002)us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = dy_IssuerMember | (4,997)us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = dy_IssuerMember | (15,001)us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = dy_IssuerMember | (14,985)us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = dy_IssuerMember
Other income, net | 0us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = dy_IssuerMember | 0us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = dy_IssuerMember | 0us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = dy_IssuerMember | 0us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = dy_IssuerMember
Income before income taxes | (5,133)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = dy_IssuerMember | (5,208)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = dy_IssuerMember | (15,372)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = dy_IssuerMember | (15,636)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = dy_IssuerMember
Provision (benefit) for income taxes: | (1,889)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = dy_IssuerMember | (2,063)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = dy_IssuerMember | (5,926)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = dy_IssuerMember | (6,252)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = dy_IssuerMember
Net income (loss) before equity in earnings of subsidiaries | (3,244)dy_NetIncomeLossBeforeEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = dy_IssuerMember | (3,145)dy_NetIncomeLossBeforeEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = dy_IssuerMember | (9,446)dy_NetIncomeLossBeforeEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = dy_IssuerMember | (9,384)dy_NetIncomeLossBeforeEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = dy_IssuerMember
Equity in earnings (losses) of subsidiaries | 23,502dy_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = dy_IssuerMember | 11,040dy_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = dy_IssuerMember | 59,943dy_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = dy_IssuerMember | 32,872dy_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = dy_IssuerMember
Net income | 20,258us-gaap_NetIncomeLoss / dei_LegalEntityAxis = dy_IssuerMember | 7,895us-gaap_NetIncomeLoss / dei_LegalEntityAxis = dy_IssuerMember | 50,497us-gaap_NetIncomeLoss / dei_LegalEntityAxis = dy_IssuerMember | 23,488us-gaap_NetIncomeLoss / dei_LegalEntityAxis = dy_IssuerMember
Foreign currency translation gains (losses), net of tax | 38us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = dy_IssuerMember | (46)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = dy_IssuerMember | (688)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = dy_IssuerMember | (332)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = dy_IssuerMember
Comprehensive income | 20,296us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = dy_IssuerMember | 7,849us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = dy_IssuerMember | 49,809us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = dy_IssuerMember | 23,156us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = dy_IssuerMember
Subsidiary Guarantors |  |  |  |
Revenues [Abstract] |  |  |  |
Contract revenues | 490,351us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 423,853us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 1,434,010us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 1,321,684us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
EXPENSES: |  |  |  |
Costs of earned revenues, excluding depreciation and amortization | 386,689us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 348,602us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 1,139,962us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 1,081,975us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
General and administrative | 28,552us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 26,308us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 83,222us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 80,574us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Depreciation and amortization | 21,344us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 20,506us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 62,715us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 63,357us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Intercompany charges (income), net | 16,877dy_IntercompanyChargesIncome / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 12,669dy_IntercompanyChargesIncome / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 48,799dy_IntercompanyChargesIncome / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 40,049dy_IntercompanyChargesIncome / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Interest expense, net | (9)us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (10)us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (4)us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Other income, net | 3,438us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 5,554us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 7,132us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 8,130us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Income before income taxes | 40,318us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 21,322us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 106,434us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 63,855us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Provision (benefit) for income taxes: | 14,965us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 8,447us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 41,030us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 25,533us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net income (loss) before equity in earnings of subsidiaries | 25,353dy_NetIncomeLossBeforeEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 12,875dy_NetIncomeLossBeforeEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 65,404dy_NetIncomeLossBeforeEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 38,322dy_NetIncomeLossBeforeEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Equity in earnings (losses) of subsidiaries | (10)dy_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 70dy_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (261)dy_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 70dy_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net income | 25,343us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 12,945us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 65,143us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 38,392us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Foreign currency translation gains (losses), net of tax | 0us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Comprehensive income | 25,343us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 12,945us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 65,143us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 38,392us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Non- Guarantor Subsidiaries |  |  |  |
Revenues [Abstract] |  |  |  |
Contract revenues | 2,012us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 2,431us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 9,823us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 7,838us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
EXPENSES: |  |  |  |
Costs of earned revenues, excluding depreciation and amortization | 1,550us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 1,750us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 7,174us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 5,849us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
General and administrative | 2,775us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 2,765us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 9,569us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 8,176us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
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Intercompany charges (income), net | (583)dy_IntercompanyChargesIncome / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (61)dy_IntercompanyChargesIncome / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (1,675)dy_IntercompanyChargesIncome / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (336)dy_IntercompanyChargesIncome / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Interest expense, net | 0us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Other income, net | 33us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 39us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (131)us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 67us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Income before income taxes | (2,928)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (3,040)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (8,887)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (9,082)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Provision (benefit) for income taxes: | (1,077)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (1,205)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (3,426)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (3,632)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net income (loss) before equity in earnings of subsidiaries | (1,851)dy_NetIncomeLossBeforeEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (1,835)dy_NetIncomeLossBeforeEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (5,461)dy_NetIncomeLossBeforeEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (5,450)dy_NetIncomeLossBeforeEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Equity in earnings (losses) of subsidiaries | 0dy_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0dy_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0dy_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0dy_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
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Foreign currency translation gains (losses), net of tax | 38us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (46)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (688)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (332)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Comprehensive income | (1,813)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (1,881)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (6,149)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (5,782)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Eliminations and Reclassifications |  |  |  |
Revenues [Abstract] |  |  |  |
Contract revenues | 0us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
EXPENSES: |  |  |  |
Costs of earned revenues, excluding depreciation and amortization | 0us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
General and administrative | 0us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Depreciation and amortization | 0us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Intercompany charges (income), net | 0dy_IntercompanyChargesIncome / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0dy_IntercompanyChargesIncome / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0dy_IntercompanyChargesIncome / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0dy_IntercompanyChargesIncome / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Interest expense, net | 0us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Other income, net | 0us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Income before income taxes | 0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Provision (benefit) for income taxes: | 0us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net income (loss) before equity in earnings of subsidiaries | 0dy_NetIncomeLossBeforeEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0dy_NetIncomeLossBeforeEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0dy_NetIncomeLossBeforeEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0dy_NetIncomeLossBeforeEquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Equity in earnings (losses) of subsidiaries | (43,750)dy_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (19,005)dy_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (110,179)dy_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (56,430)dy_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net income | (43,750)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (19,005)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (110,179)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (56,430)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Foreign currency translation gains (losses), net of tax | (76)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 92us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 1,376us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 664us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Comprehensive income | $ (43,826)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | $ (18,913)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | $ (108,803)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | $ (55,766)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember

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