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COMMITMENTS AND VARIABLE INTEREST ENTITIES - Variable Interest Entities (Details)	12 Months Ended
	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

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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

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