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COMMITMENTS AND VARIABLE INTEREST ENTITIES - Variable Interest Entities (Details) | 3 Months Ended
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Apr. 03, 2026 entity
Commitments and Variable Interest Entities [Abstract] |
Percentage of costs reimbursed to WES by Genesys | 10.00%
Number of VIEs | 1

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

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- Definition Represents the information pertaining to number of variable entities. + References No definition available. + Details
Name: | wldn_NumberOfVariableInterestEntity
Namespace Prefix: | wldn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The percentage of costs reimbursed. + References No definition available. + Details
Name: | wldn_VariableInterestEntityPercentageOfCostsReimbursed
Namespace Prefix: | wldn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration