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SUPPLEMENTAL FINANCIAL STATEMENT DATA - Accounts Receivable - Factoring Agreements (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 30, 2022 | Dec. 31, 2021
SUPPLEMENTAL FINANCIAL STATEMENT DATA |  |
Cash proceeds from sale of trade receivables | $ 0 | $ 8,000
Discount on trade accounts receivable sold |  | $ 800

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

X
- Definition The amount of discount related to trade accounts receivable sold. + References No definition available. + Details
Name: | wldn_DiscountOnTradeAccountsReceivableSold
Namespace Prefix: | wldn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of cash inflow from sale of trade accounts receivables. + References No definition available. + Details
Name: | wldn_ProceedsFromSaleOfTradeAccountsReceivable
Namespace Prefix: | wldn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration