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Basis of Presentation and Accounting Policies (Details) (USD $)	3 Months Ended		9 Months Ended
	Apr. 25, 2015 subsidiary segment	Apr. 26, 2014	Apr. 25, 2015	Apr. 26, 2014	Jul. 26, 2014
Segment Reporting Information [Line Items]
Number of reportable segments	1us-gaap_NumberOfReportableSegments
Number of subsidiaries	2dy_NumberofSubsidiaries
Contract revenues	$ 492,363,000us-gaap_SalesRevenueServicesNet	$ 426,284,000us-gaap_SalesRevenueServicesNet	$ 1,443,833,000us-gaap_SalesRevenueServicesNet	$ 1,329,522,000us-gaap_SalesRevenueServicesNet
Restricted cash	4,500,000us-gaap_RestrictedCashAndCashEquivalents		4,500,000us-gaap_RestrictedCashAndCashEquivalents		4,000,000us-gaap_RestrictedCashAndCashEquivalents
Investments and Other Noncurrent Assets	4,000,000us-gaap_InvestmentsAndOtherNoncurrentAssets		4,000,000us-gaap_InvestmentsAndOtherNoncurrentAssets
Investment dividend rate	5.25%us-gaap_PreferredStockDividendRatePercentage
Senior Subordinated Notes | 7.125% Senior Subordinated Notes Due 2021
Segment Reporting Information [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		7.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = dy_SevenPointOneTwoFivePercentSeniorSubordinatedNotesDue2021Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorSubordinatedNotesMember
Canada
Segment Reporting Information [Line Items]
Contract revenues	$ 2,000,000us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_CA	$ 2,500,000us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_CA	$ 9,800,000us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_CA	$ 7,900,000us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_CA

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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))

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(d))

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