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Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jan. 24, 2015 | Jan. 25, 2014 | Jan. 24, 2015 | Jan. 25, 2014
Real property and equipment leases |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total expense under lease agreements | $ 769 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = dy_RealpropertyandequipmentleasesMember | $ 838 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = dy_RealpropertyandequipmentleasesMember | $ 1,296 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = dy_RealpropertyandequipmentleasesMember | $ 1,608 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = dy_RealpropertyandequipmentleasesMember
Subcontractors and materials expense |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total expense under lease agreements | $ 686 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = dy_SubcontractorsandmaterialsexpenseMember | $ 605 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = dy_SubcontractorsandmaterialsexpenseMember | $ 1,189 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = dy_SubcontractorsandmaterialsexpenseMember | $ 1,266 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = dy_SubcontractorsandmaterialsexpenseMember

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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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