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COMMITMENTS AND VARIABLE INTEREST ENTITIES - Variable Interest Entities (Details)	12 Months Ended
	Dec. 30, 2022 entity
COMMITMENTS AND VARIABLE INTEREST ENTITIES
Number of VIEs	1

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- References

No definition available.

+ Details

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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

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Namespace Prefix:	wldn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration