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Employee Benefit Plans - Narratives (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2023 | Dec. 31, 2022 | Jan. 25, 2025 | Jan. 27, 2024 | Jan. 28, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Defined contribution maximum annual contribution for employee |  | 75.00% |  |  |
Defined contribution employer match | 50.00% | 30.00% |  |  |
Defined contribution employer match | 6.00% | 5.00% |  |  |
Employer contribution amount |  |  | $ 12.3 | $ 10.9 | $ 5.3
Maximum |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Plan contribution |  |  | 5.00% |  |

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- Definition The company contribution to a multiemployer plan as a percentage of total contributions. + References No definition available. + Details
Name: | dy_ContributiontoPlanCompanyPercentageofTotal
Namespace Prefix: | dy_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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Data Type: | dtr-types:percentItemType
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Details
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