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v3.26.1

LEASES - Rent Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 03, 2026 | Jul. 04, 2025 | Jul. 03, 2026 | Jul. 04, 2025
Leases [Abstract] |  |  |  |
Rent expenses | $ 1.7 | $ 1.7 | $ 3.3 | $ 3.5

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