XML 92 R82.htm IDEA: XBRL DOCUMENT
v3.25.2

BUSINESS COMBINATIONS - Pro Forma Information - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 04, 2025 | Jul. 04, 2025 | Jun. 28, 2024
Alternative Power Generation, Inc., Alternative Power Generation, Inc., and Enica Engineering, PLLC |  |  |
Business Acquisition, Pro Forma Information |  |  |
Business combination, pro forma information, revenue of acquiree since acquisition date, actual | $ 11.1 | $ 17.2 |
Business combination, pro forma information, income (loss) from continuing operations of acquiree since acquisition date, actual | 2.0 | 3.0 |
Alternative Power Generation, Inc. |  |  |
Business Acquisition, Pro Forma Information |  |  |
Business combination, pro forma information, revenue of acquiree since acquisition date, actual | 7.3 | 9.9 |
Business combination, pro forma information, income (loss) from continuing operations of acquiree since acquisition date, actual | 0.8 | 0.9 |
Alpha Inspections, Inc. |  |  |
Business Acquisition, Pro Forma Information |  |  |
Business combination, pro forma information, revenue of acquiree since acquisition date, actual | 0.9 | 1.5 |
Business combination, pro forma information, income (loss) from continuing operations of acquiree since acquisition date, actual | 0.5 |  | $ 0.7
Enica Engineering, PLLC |  |  |
Business Acquisition, Pro Forma Information |  |  |
Business combination, pro forma information, revenue of acquiree since acquisition date, actual | 2.9 | 5.8 |
Business combination, pro forma information, income (loss) from continuing operations of acquiree since acquisition date, actual | $ 0.7 | $ 1.4 |

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

X
- Definition Amount of acquiree's revenue since acquisition date of business combination included in consolidated statement of income. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-8 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 49 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479303/805-10-55-49 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-2 + Details
Name: | us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Business Combination, Pro Forma Information, Income (Loss) from Continuing Operations of Acquiree since Acquisition Date, Actual + References No definition available. + Details
Name: | wldn_BusinessCombinationProFormaInformationIncomeLossFromContinuingOperationsOfAcquireeSinceAcquisitionDateActual
Namespace Prefix: | wldn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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: |