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Goodwill and Intangible Assets - Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified | Apr. 25, 2015 | Jan. 24, 2015 | Jul. 26, 2014
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Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets Gross Excluding Goodwill | $ 201,235us-gaap_IntangibleAssetsGrossExcludingGoodwill |  | $ 202,179us-gaap_IntangibleAssetsGrossExcludingGoodwill
Finite-Lived Intangible Assets, Accumulated Amortization | 91,204us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  | 86,063us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Intangible assets, net | 110,031us-gaap_IntangibleAssetsNetExcludingGoodwill |  | 116,116us-gaap_IntangibleAssetsNetExcludingGoodwill
Customer relationships |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Carrying amount | 179,859us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 400us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 173,594us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Finite-Lived Intangible Assets, Accumulated Amortization | 79,531us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | 69,048us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Contract backlog |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Carrying amount | 8,076us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember |  | 15,285us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember
Finite-Lived Intangible Assets, Accumulated Amortization | 7,121us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember |  | 13,490us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember
Trade names |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Carrying amount | 8,200us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |  | 8,200us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Finite-Lived Intangible Assets, Accumulated Amortization | 4,328us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |  | 3,361us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Non-compete agreements |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Carrying amount | 400us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |  | 400us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember
Finite-Lived Intangible Assets, Accumulated Amortization | 224us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |  | 164us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember
UtiliQuest |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
UtiliQuest trade name | $ 4,700us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = dy_UtiliquestMember |  | $ 4,700us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = dy_UtiliquestMember

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