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Debt - Outstanding (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 24, 2015
Jul. 26, 2014
Debt Instrument [Line Items]    
Debt and capital lease obligations $ 433,918us-gaap_DebtAndCapitalLeaseObligations $ 457,801us-gaap_DebtAndCapitalLeaseObligations
Long-term debt premium on 7.125% senior subordinated notes (amortizes to interest expense through January 2021) 3,000us-gaap_DebtInstrumentUnamortizedPremium 3,200us-gaap_DebtInstrumentUnamortizedPremium
Less: current portion (12,500)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent (10,938)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Long-term debt 421,418us-gaap_LongTermDebtAndCapitalLeaseObligations 446,863us-gaap_LongTermDebtAndCapitalLeaseObligations
Senior Credit Agreement - Revolving facility (matures December 2017) | Credit Agreement, December 3, 2012, Maturing December 2017    
Debt Instrument [Line Items]    
Debt and capital lease obligations 44,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= dy_CreditAgreementDecember32012MaturingDecember2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
63,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= dy_CreditAgreementDecember32012MaturingDecember2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
Senior Credit Agreement - Term Loan (matures December 2017) | Credit Agreement, December 3, 2012, Maturing December 2017    
Debt Instrument [Line Items]    
Debt and capital lease obligations 109,375us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= dy_CreditAgreementDecember32012MaturingDecember2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorLoansMember
114,063us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= dy_CreditAgreementDecember32012MaturingDecember2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorLoansMember
Senior Subordinated Notes | 7.125% Senior Subordinated Notes Due 2021    
Debt Instrument [Line Items]    
Debt, interest rate (in percent) 7.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dy_SevenPointOneTwoFivePercentSeniorSubordinatedNotesDue2021Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
7.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dy_SevenPointOneTwoFivePercentSeniorSubordinatedNotesDue2021Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
Debt and capital lease obligations 277,500us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= dy_SevenPointOneTwoFivePercentSeniorSubordinatedNotesDue2021Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
277,500us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= dy_SevenPointOneTwoFivePercentSeniorSubordinatedNotesDue2021Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
Long-term debt premium on 7.125% senior subordinated notes (amortizes to interest expense through January 2021) $ 3,043us-gaap_DebtInstrumentUnamortizedPremium
/ us-gaap_DebtInstrumentAxis
= dy_SevenPointOneTwoFivePercentSeniorSubordinatedNotesDue2021Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
$ 3,238us-gaap_DebtInstrumentUnamortizedPremium
/ us-gaap_DebtInstrumentAxis
= dy_SevenPointOneTwoFivePercentSeniorSubordinatedNotesDue2021Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember