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COMMITMENTS AND VARIABLE INTEREST ENTITIES - Variable Interest Entities (Details) | 3 Months Ended
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Mar. 31, 2023 entity
COMMITMENTS AND VARIABLE INTEREST ENTITIES |
Number of VIEs | 1

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

X
- 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