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v3.23.1

SUPPLEMENTAL FINANCIAL STATEMENT DATA - Accounts Receivable (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Apr. 01, 2022
SUPPLEMENTAL FINANCIAL STATEMENT DATA |  |
Cash proceeds from sale of trade receivables | $ 0 | $ 0

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 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