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v2.4.1.9

Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Jan. 24, 2015 | Jul. 26, 2014
Loss Contingencies [Line Items] |  |
Construction liens | $ 17.7 dy_ConstructionLiens |
Loss Contingency, Damages Sought | 2.6 |
Credit Agreement, December 3, 2012, Maturing December 2017 | Senior Credit Agreement - Revolving facility (matures December 2017) | Standby Letters of Credit |  |
Loss Contingencies [Line Items] |  |
Letters of credit outstanding amount | 54.4 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = us-gaap_StandbyLettersOfCreditMember / us-gaap_DebtInstrumentAxis = dy_CreditAgreementDecember32012MaturingDecember2017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember | 49.4 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = us-gaap_StandbyLettersOfCreditMember / us-gaap_DebtInstrumentAxis = dy_CreditAgreementDecember32012MaturingDecember2017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember
Performance Guarantee and Surety Bond |  |
Loss Contingencies [Line Items] |  |
Outstanding performance and other surety contract bonds | 393.2 us-gaap_GuaranteeObligationsCurrentCarryingValue / us-gaap_GuaranteeObligationsByNatureAxis = dy_PerformanceGuaranteeAndSuretyBondMember | 446.8 us-gaap_GuaranteeObligationsCurrentCarryingValue / us-gaap_GuaranteeObligationsByNatureAxis = dy_PerformanceGuaranteeAndSuretyBondMember
Other Accrued Liabilities |  |
Loss Contingencies [Line Items] |  |
Settlement liability | $ 0.6 us-gaap_SettlementLiabilitiesCurrent / us-gaap_BalanceSheetLocationAxis = dy_OtherAccruedLiabilitiesMember |

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- Definition Construction liens on outstanding accounts receivable. + References No definition available. + Details
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Namespace Prefix: | dy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Balance Type: | na
Period Type: | duration

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- Definition Describes the form and magnitude of the award the plaintiff seeks in the legal matter, which may include an unspecified amount of money. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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- Definition Amounts payable for money transfers, money orders, and consumer payment service arrangements. Settlement liabilities include amounts payable to intermediaries for global payment transfers. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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