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v2.4.1.9

Supplemental Consolidating Financial Statements (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
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
7.125% Senior Subordinated Notes Due 2021 | Senior Subordinated Notes |  |
Debt Instrument [Line Items] |  |
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

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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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