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v2.4.1.9

Basis of Presentation and Accounting Policies (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jan. 24, 2015 subsidiary segment | Jan. 25, 2014 | Jan. 24, 2015 | Jan. 25, 2014 | Jul. 26, 2014
Segment Reporting Information [Line Items] |  |  |  |  |
Number of reportable segments | 1 us-gaap_NumberOfReportableSegments |  |  |  |
Number of subsidiaries | 2 dy_NumberofSubsidiaries |  |  |  |
Contract revenues | $ 441,081,000 us-gaap_SalesRevenueServicesNet | $ 390,518,000 us-gaap_SalesRevenueServicesNet | $ 951,470,000 us-gaap_SalesRevenueServicesNet | $ 903,238,000 us-gaap_SalesRevenueServicesNet |
Restricted cash | 4,500,000 us-gaap_RestrictedCashAndCashEquivalents |  | 4,500,000 us-gaap_RestrictedCashAndCashEquivalents |  | 4,000,000 us-gaap_RestrictedCashAndCashEquivalents
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 | $ 3,100,000 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_CA | $ 2,100,000 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_CA | $ 7,800,000 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_CA | $ 5,400,000 us-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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- Definition 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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References 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)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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