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Goodwill and Intangible Assets - Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified | Jan. 24, 2015 | Jul. 26, 2014
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Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Intangible Assets Gross Excluding Goodwill | $ 201,235 us-gaap_IntangibleAssetsGrossExcludingGoodwill | $ 202,179 us-gaap_IntangibleAssetsGrossExcludingGoodwill
Finite-Lived Intangible Assets, Accumulated Amortization | 87,062 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | 86,063 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Intangible assets, net | 114,173 us-gaap_IntangibleAssetsNetExcludingGoodwill | 116,116 us-gaap_IntangibleAssetsNetExcludingGoodwill
Customer relationships |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Carrying amount | 179,859 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 173,594 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Finite-Lived Intangible Assets, Accumulated Amortization | 75,979 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 69,048 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Contract backlog |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Carrying amount | 8,076 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember | 15,285 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember
Finite-Lived Intangible Assets, Accumulated Amortization | 6,874 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember | 13,490 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember
Trade names |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Carrying amount | 8,200 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | 8,200 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Finite-Lived Intangible Assets, Accumulated Amortization | 4,005 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | 3,361 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Non-compete agreements |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Carrying amount | 400 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember | 400 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember
Finite-Lived Intangible Assets, Accumulated Amortization | 204 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember | 164 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember
UtiliQuest |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
UtiliQuest trade name | $ 4,700 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = dy_UtiliquestMember | $ 4,700 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = dy_UtiliquestMember

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