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BUSINESS COMBINATIONS - Pro Forma Information - Additional Information (Details) - Enica Engineering, PLLC $ in Millions	12 Months Ended
	Dec. 27, 2024 USD ($)
Business Acquisition, Pro Forma Information
Business combination, pro forma information, revenue of acquiree since acquisition date, actual	$ 1.8
Business combination, pro forma information, income (loss) from continuing operations of acquiree since acquisition date, actual	$ 0.4

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

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479328/805-10-50-2

+ Details

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X

- Definition

Business Combination, Pro Forma Information, Income (Loss) from Continuing Operations of Acquiree since Acquisition Date, Actual

+ References

No definition available.

+ Details

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Namespace Prefix:	wldn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: