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Capital Stock (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 24, 2015 | Jan. 24, 2015 | Jan. 25, 2014 | Jul. 26, 2014 | Feb. 24, 2015 | Aug. 27, 2013
Class of Stock [Line Items] |  |  |  |  |  |
Number of Shares Repurchased | 488,768 us-gaap_StockRepurchasedDuringPeriodShares |  |  | 360,900 us-gaap_StockRepurchasedDuringPeriodShares |  |
Average Price Per Share (in dollars per share) | $ 35.08 dy_AveragePricePerShareRepurchaseOfCommonStock |  |  | $ 27.71 dy_AveragePricePerShareRepurchaseOfCommonStock |  |
Total Consideration (Dollars in thousands) | $ 17,100,000 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 17,147,000 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 9,999,000 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 10,000,000 us-gaap_PaymentsForRepurchaseOfCommonStock |  |
Shares Paid for Tax Withholding for Share Based Compensation |  | 138,535 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation | 130,195 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation |  |  |
Value of Shares Paid for Tax Withholding for Share Based Compensation |  | 4,300,000 dy_ValueofSharesPaidforTaxWithholdingforShareBasedCompensation | 3,600,000 dy_ValueofSharesPaidforTaxWithholdingforShareBasedCompensation |  |  |
Common Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Remaining authorized repurchase amount | 12,900,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 12,900,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |  |
Common stock authorized repurchase amount |  |  |  |  | $ 40,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | $ 40,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember

X
- Definition The total costs of shares repurchased during the period divided by the total number of shares that have been repurchased during the period which have not been retired and are not held in treasury. + References No definition available. + Details
Name: | dy_AveragePricePerShareRepurchaseOfCommonStock
Namespace Prefix: | dy_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the monetary value of shares the employees use to repay the employer. + References No definition available. + Details
Name: | dy_ValueofSharesPaidforTaxWithholdingforShareBasedCompensation
Namespace Prefix: | dy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_ClassOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
Name: | us-gaap_PaymentsForRepurchaseOfCommonStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
Name: | us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
Name: | us-gaap_StockRepurchasedDuringPeriodShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
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: |