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v3.26.1

REVENUES - General Information (Details) | 6 Months Ended
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Jul. 03, 2026
Revenue |
Percent of revenue, low end of range (as a percent) | 1.00%
Percent of revenue, high end of range (as a percent) | 2.00%

X
- References No definition available. + Details
Name: | us-gaap_DisaggregationOfRevenueAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percent of Total Revenue Comprised of Contracts Which Include Separate Phases or Elements, High End of Range + References No definition available. + Details
Name: | wldn_PercentOfTotalRevenueComprisedOfContractsWhichIncludeSeparatePhasesOrElementsHighEndOfRange
Namespace Prefix: | wldn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percent of Total Revenue Comprised of Contracts Which Include Separate Phases or Elements, Low End of Range + References No definition available. + Details
Name: | wldn_PercentOfTotalRevenueComprisedOfContractsWhichIncludeSeparatePhasesOrElementsLowEndOfRange
Namespace Prefix: | wldn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration