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SUPPLEMENTAL FINANCIAL STATEMENT DATA - Accounts Receivable (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2022 USD ($)
SUPPLEMENTAL FINANCIAL STATEMENT DATA |
Cash proceeds from sale of trade receivables | $ 8.0
Discount on trade accounts receivable sold | $ 0.8

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: | credit
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