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REVENUES - Retainage (Details) - USD ($) $ in Thousands | Apr. 03, 2026 | Jan. 02, 2026
--- | --- | ---
Construction Contractor, Receivable, Retainage |  |
Contract assets included retainage | $ 23,900 | $ 29,500
Contract with Customer, Liability |  |
Contract liabilities included retainage | $ 4,500 | $ 0

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- Definition Amount of right to consideration in exchange for good or service transferred to customer withheld under retainage provision in long-term contract or program when right to consideration is unconditional. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 910 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482546/910-10-50-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)(c)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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- Definition Contract with Customer, Liability, Retainage + References No definition available. + Details
Name: | wldn_ContractWithCustomerLiabilityRetainage
Namespace Prefix: | wldn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant