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LEASES - Rent Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 27, 2024	Dec. 29, 2023	Dec. 30, 2022
LEASES
Rent expenses	$ 6.9	$ 6.8	$ 6.5

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- References

No definition available.

+ Details

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

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- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

No definition available.

+ Details

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