XML 75 R65.htm IDEA: XBRL DOCUMENT
v3.22.2.2

SEGMENT AND GEOGRAPHICAL INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Oct. 01, 2021 | Sep. 30, 2022 | Oct. 01, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 121,399 | $ 98,297 | $ 315,882 | $ 261,537
Domestic |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 315,882 | 261,537
Energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 102,625 | 81,524 | 262,186 | 209,977
Energy | Domestic |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 262,186 | 209,977
Engineering and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 18,774 | 16,773 | 53,696 | 51,560
Engineering and Consulting | Domestic |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 53,696 | 51,560
Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 8,224 | 9,309 | 25,968 | 24,723
Commercial | Energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 6,848 | 7,741 | 21,638 | 20,685
Commercial | Engineering and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,376 | 1,568 | 4,330 | 4,037
Government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 65,421 | 33,718 | 145,432 | 93,157
Government | Energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 48,073 | 18,537 | 96,293 | 45,766
Government | Engineering and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 17,348 | 15,181 | 49,139 | 47,391
Utilities |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 47,754 | 55,269 | 144,482 | 143,657
Utilities | Energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 47,704 | 55,245 | 144,255 | 143,525
Utilities | Engineering and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 50 | 24 | 227 | 132
Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 21,348 | 22,264 | 64,094 | 65,504
Time-and-materials | Energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 7,468 | 9,104 | 23,873 | 25,060
Time-and-materials | Engineering and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 13,880 | 13,160 | 40,221 | 40,444
Unit-based |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 46,830 | 54,120 | 139,070 | 140,505
Unit-based | Energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 43,039 | 51,470 | 128,540 | 132,688
Unit-based | Engineering and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 3,791 | 2,650 | 10,530 | 7,817
Fixed price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 53,221 | 21,913 | 112,718 | 55,528
Fixed price | Energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 52,118 | 20,950 | 109,773 | 52,229
Fixed price | Engineering and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 1,103 | $ 963 | $ 2,945 | $ 3,299

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

X
- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 9: 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 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI https://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
Name: | us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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

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

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

X
- Details
Name: | us-gaap_ContractWithCustomerBasisOfPricingAxis=us-gaap_TimeAndMaterialsContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ContractWithCustomerBasisOfPricingAxis=wldn_UnitBasedContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ContractWithCustomerBasisOfPricingAxis=us-gaap_FixedPriceContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |