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v3.26.1

LEASES - Rent Expense (Details) - USD ($) $ in Millions | 3 Months Ended
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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