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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

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