XML 29 R20.htm IDEA: XBRL DOCUMENT
v3.23.1

REVENUES (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2023
REVENUES |
Schedule of Contracts by Reportable Segments and Type of Contracts | ​
Segment | Contract Type | Revenue Recognition Method
​ | Time-and-materials | Time-and-materials
Energy | Unit-based | Unit-based
​ | Software license | Unit-based
​ | Fixed price | Percentage-of-completion
​ | Time-and-materials | Time-and-materials
Engineering and Consulting | Unit-based | Unit-based
​ | Fixed price | Percentage-of-completion
​

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

X
- Definition Tabular disclosure of contracts for revenue generating activities by type and by reporting segment. + References No definition available. + Details
Name: | wldn_ScheduleOfByTypeAndReportableSegmentTableTextBlock
Namespace Prefix: | wldn_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration