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Subsequent Events (Details) - USD ($) | Feb. 23, 2016 | Aug. 25, 2015 | Jan. 23, 2016
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Subsequent Event [Line Items] |  |  |
Share repurchase program, additional amount authorized for repurchase |  | $ 50,000,000.0 |
Stock repurchase program, period in force |  | 18 months |
Stock repurchase program, authorized amount |  | $ 50,000,000 |
Remaining authorized repurchase amount |  |  | $ 50,000,000
Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Share repurchase program, additional amount authorized for repurchase | $ 50,000,000 |  |
Stock repurchase program, period in force extension | 6 months |  |
Stock repurchase program, authorized amount | $ 100,000,000 |  |
Remaining authorized repurchase amount | $ 100,000,000 |  |

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- Definition Share Repurchase Program, Additional Amount Authorized for Repurchase + References No definition available. + Details
Name: | dy_ShareRepurchaseProgramAdditionalAmountAuthorizedforRepurchase
Namespace Prefix: | dy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Stock Repurchase Program, Period in Force Extension + References No definition available. + Details
Name: | dy_StockRepurchaseProgramPeriodinForceExtension
Namespace Prefix: | dy_
Data Type: | xbrli:durationItemType
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 Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramPeriodInForce1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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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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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |