XML 67 R58.htm IDEA: XBRL DOCUMENT
v3.23.3

SEGMENT AND GEOGRAPHICAL INFORMATION - Concentration Risk (Details) - Revenue from Contract with Customer Benchmark | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2023 | Sep. 30, 2022 | Sep. 29, 2023 | Sep. 30, 2022
Customer Concentration Risk | Top Ten Customers |  |  |  |
Concentration Risk |  |  |  |
Concentration risk (as a percent) | 52.90% | 57.20% | 50.60% | 54.50%
Customer Concentration Risk | Los Angeles Department of Water and Power |  |  |  |
Concentration Risk |  |  |  |
Concentration risk (as a percent) |  |  |  | 13.20%
Customer Concentration Risk | Pueblo County School District |  |  |  |
Concentration Risk |  |  |  |
Concentration risk (as a percent) |  | 13.30% |  |
Customer Concentration Risk | Pueblo County School District and Dormitory Authority State of New York | Energy |  |  |  |
Concentration Risk |  |  |  |
Concentration risk (as a percent) | 21.70% |  |  |
Customer Concentration Risk | Pueblo County School District, Dormitory Authority State of New York, and Los Angeles Department of Water and Power | Energy |  |  |  |
Concentration Risk |  |  |  |
Concentration risk (as a percent) |  | 38.30% |  |
Customer Concentration Risk | Los Angeles Department of Water and Power, and The Dormitory Authority State of New York | Energy |  |  |  |
Concentration Risk |  |  |  |
Concentration risk (as a percent) |  |  | 22.70% | 26.50%
Geographic Concentration Risk | California |  |  |  |
Concentration Risk |  |  |  |
Concentration risk (as a percent) | 42.80% | 37.20% | 42.20% | 40.30%
Geographic Concentration Risk | New York |  |  |  |
Concentration Risk |  |  |  |
Concentration risk (as a percent) | 23.60% | 23.40% | 24.70% | 21.40%

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 954 -SubTopic 310 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481027/954-310-50-2 + Details
Name: | us-gaap_ConcentrationRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-42 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-21 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-20 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482861/275-10-50-18 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482861/275-10-50-20 + Details
Name: | us-gaap_ConcentrationRiskPercentage1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_RevenueFromContractWithCustomerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=wldn_TopTenCustomersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=wldn_LosAngelesDepartmentOfWaterAndPowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=wldn_PuebloCountySchoolDistrictMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=wldn_PuebloCountySchoolDistrictAndDormitoryAuthorityStateOfNewYorkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wldn_EnergyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=wldn_PuebloCountySchoolDistrictDormitoryAuthorityStateOfNewYorkAndLosAngelesDepartmentOfWaterAndPowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=wldn_LosAngelesDepartmentOfWaterAndPowerAndDormitoryAuthorityStateOfNewYorkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_GeographicConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_CA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_NY
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |