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ORGANIZATION AND OPERATIONS OF THE COMPANY - Variable Interest Entities (Details) | 12 Months Ended
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Dec. 29, 2023 entity
ORGANIZATION AND OPERATIONS OF THE COMPANY |
Number of VIEs | 1

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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