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SUBSEQUENT EVENTS (Details) - Notes Payable to Banks [Member] - Credit Agreement 2019 [Member] - USD ($) $ in Millions	Aug. 02, 2022	Jul. 01, 2022
Subsequent Event [Line Items]
Debt instrument, covenants, purchase money indebtedness and Capitalized Lease Obligations		$ 1.5
Subsequent Event
Subsequent Event [Line Items]
Debt instrument, covenants, purchase money indebtedness and Capitalized Lease Obligations	$ 4.0

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Debt Instrument, Covenants, Purchase Money Indebtedness and Capitalized Lease Obligations

+ References

No definition available.

+ Details

Name:	wldn_DebtInstrumentCovenantsPurchaseMoneyIndebtednessAndCapitalizedLeaseObligations
Namespace Prefix:	wldn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_NotesPayableToBanksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=wldn_CreditAgreement2019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: