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LEASES - Rent Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 03, 2026	Apr. 04, 2025
Leases [Abstract]
Rent expenses	$ 1.6	$ 1.8

X

- References

No definition available.

+ Details

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

X

- 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