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Debt - Outstanding (Details) (USD $) In Thousands, unless otherwise specified | Apr. 25, 2015 | Jul. 26, 2014
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Debt Instrument [Line Items] |  |
Debt and capital lease obligations | $ 446,692us-gaap_DebtAndCapitalLeaseObligations | $ 457,801us-gaap_DebtAndCapitalLeaseObligations
Long-term debt premium on 7.125% senior subordinated notes (amortizes to interest expense through January 2021) | 2,900us-gaap_DebtInstrumentUnamortizedPremium | 3,200us-gaap_DebtInstrumentUnamortizedPremium
Less: current portion | 0us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent | (10,938)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Long-term debt | 446,692us-gaap_LongTermDebtAndCapitalLeaseObligations | 446,863us-gaap_LongTermDebtAndCapitalLeaseObligations
7.125% Senior Subordinated Notes Due 2021 |  |
Debt Instrument [Line Items] |  |
Debt and capital lease obligations | 280,400us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = dy_SevenPointOneTwoFivePercentSeniorSubordinatedNotesDue2021Member | 280,700us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = dy_SevenPointOneTwoFivePercentSeniorSubordinatedNotesDue2021Member
Credit Agreement - Revolving facility (matures April 2020) | Credit Agreement [Member] |  |
Debt Instrument [Line Items] |  |
Debt and capital lease obligations | 16,250us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = dy_CreditAgreementMember / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember | 63,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = dy_CreditAgreementMember / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember
Credit Agreement - Term Loan (matures April 2020) | Credit Agreement [Member] |  |
Debt Instrument [Line Items] |  |
Debt and capital lease obligations | 150,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = dy_CreditAgreementMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorLoansMember | 114,063us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = dy_CreditAgreementMember / 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) | $ 2,942us-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

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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 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 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer. + 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 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H + Details
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- Definition Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer. + 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 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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