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REVENUES - General Information (Details)	3 Months Ended
	Apr. 03, 2026
Revenue
Percent of revenue, low end of range (as a percent)	1.00%
Percent of revenue, high end of range (as a percent)	2.00%

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percent of Total Revenue Comprised of Contracts Which Include Separate Phases or Elements, High End of Range

+ References

No definition available.

+ Details

Name:	wldn_PercentOfTotalRevenueComprisedOfContractsWhichIncludeSeparatePhasesOrElementsHighEndOfRange
Namespace Prefix:	wldn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percent of Total Revenue Comprised of Contracts Which Include Separate Phases or Elements, Low End of Range

+ References

No definition available.

+ Details

Name:	wldn_PercentOfTotalRevenueComprisedOfContractsWhichIncludeSeparatePhasesOrElementsLowEndOfRange
Namespace Prefix:	wldn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration