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v2.4.1.9

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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- 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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