XML 97 R82.htm IDEA: XBRL DOCUMENT
v3.22.4

SEGMENT AND GEOGRAPHICAL INFORMATION - Concentration Risk (Details) | 12 Months Ended
--- | ---
Dec. 30, 2022 | Dec. 31, 2021 | Jan. 01, 2021
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Top Ten Customers |  |  |
Concentration Risk |  |  |
Concentration risk (as a percent) | 54.60% | 49.20% | 48.00%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Los Angeles Department of Water and Power |  |  |
Concentration Risk |  |  |
Concentration risk (as a percent) | 12.00% | 10.80% | 10.20%
Revenue from Contract with Customer Benchmark | Geographic Concentration Risk | California |  |  |
Concentration Risk |  |  |
Concentration risk (as a percent) | 41.70% | 36.80% | 37.00%
Revenue from Contract with Customer Benchmark | Geographic Concentration Risk | New York |  |  |
Concentration Risk |  |  |
Concentration risk (as a percent) | 22.80% | 21.00% | 19.20%
Revenue from Contract with Customer, Segment Benchmark | Customer Concentration Risk | Los Angeles Department of Water and Power | Energy |  |  |
Concentration Risk |  |  |
Concentration risk (as a percent) | 14.40% |  |
Revenue from Contract with Customer, Segment Benchmark | Customer Concentration Risk | Los Angeles Department of Water and Power, Duke Energy, and Consolidated Edison of New York | Energy |  |  |
Concentration Risk |  |  |
Concentration risk (as a percent) |  | 34.50% |
Revenue from Contract with Customer, Segment Benchmark | 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) |  |  | 22.50%
Revenue from Contract with Customer, Segment Benchmark | Customer Concentration Risk | City of Elk Grove | Engineering and Consulting |  |  |
Concentration Risk |  |  |
Concentration risk (as a percent) |  | 10.30% | 18.20%

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 No definition available. + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13531-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13537-108611 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI https://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + 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: | 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: |

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_RevenueFromContractWithCustomerSegmentBenchmarkMember
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_LosAngelesDepartmentOfWaterAndPowerDukeEnergyAndConsolidatedEdisonOfNewYorkMember
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: | srt_MajorCustomersAxis=wldn_CityOfElkGroveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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