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Supplemental Consolidating Financial Statements (Details) (USD $) In Thousands, unless otherwise specified	Apr. 25, 2015	Jul. 26, 2014
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

X

- 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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- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

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Balance Type:
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