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COMMITMENTS AND VARIABLE INTEREST ENTITIES - Variable Interest Entities (Details) | 12 Months Ended
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Dec. 27, 2024 entity
COMMITMENTS AND VARIABLE INTEREST ENTITIES |
Percentage of costs reimbursed to WES by Genesys | 10.00%
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

X
- 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