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BUSINESS COMBINATIONS - Acquisition Related Costs (Details) $ in Millions | 3 Months Ended
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Apr. 04, 2025 USD ($)
Alternative Power Generation, Inc. |
BUSINESS COMBINATIONS |
Acquisition related costs | $ 0.2
Enica Engineering, PLLC |
BUSINESS COMBINATIONS |
Acquisition related costs | $ 0.1

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479405/805-10-25-23 + Details
Name: | us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RestructuringSettlementAndImpairmentProvisionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=wldn_AlternativePowerGenerationIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=wldn_EnicaEngineeringPllcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |