XML 90 R80.htm IDEA: XBRL DOCUMENT
v3.25.3

BUSINESS COMBINATIONS - Acquisition Related Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 03, 2025 | Oct. 03, 2025
Alternative Power Generation, Inc. |  |
BUSINESS COMBINATIONS |  |
Acquisition related costs | $ 0 | $ 200
Alpha Inspections, Inc. |  |
BUSINESS COMBINATIONS |  |
Acquisition related costs | 0 |
Enica Engineering, PLLC |  |
BUSINESS COMBINATIONS |  |
Acquisition related costs | $ 0 | $ 100

X
- Definition Amount of expense for acquisition-related cost incurred to effect business combination. Includes, but is not limited to, finder's fee; advisory, legal, accounting, valuation, and other professional and consulting fees; and general administrative cost, including cost of maintaining internal acquisition department. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-7 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 25 -Paragraph 23 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479405/805-10-25-23 + Details
Name: | us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=wldn_AlternativePowerGenerationIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=wldn_AlphaInspectionsIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=wldn_EnicaEngineeringPllcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |