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SUPPLEMENTAL FINANCIAL STATEMENT DATA - Accounts Receivable - Factoring Agreements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2022	Dec. 31, 2021
SUPPLEMENTAL FINANCIAL STATEMENT DATA
Cash proceeds from sale of trade receivables	$ 0	$ 8,000
Discount on trade accounts receivable sold		$ 800

X

- References

No definition available.

+ Details

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

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- Definition

The amount of discount related to trade accounts receivable sold.

+ References

No definition available.

+ Details

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Namespace Prefix:	wldn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

The amount of cash inflow from sale of trade accounts receivables.

+ References

No definition available.

+ Details

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Namespace Prefix:	wldn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration