XML 75 R65.htm IDEA: XBRL DOCUMENT v3.22.2

SEGMENT AND GEOGRAPHICAL INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2022	Jul. 02, 2021	Jul. 01, 2022	Jul. 02, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 102,645	$ 84,154	$ 194,483	$ 163,240
Domestic
Disaggregation of Revenue [Line Items]
Revenue	102,645	84,154	194,483	163,240
Energy
Disaggregation of Revenue [Line Items]
Revenue	84,675	66,446	159,561	128,453
Energy | Domestic
Disaggregation of Revenue [Line Items]
Revenue	84,675	66,446	159,561	128,453
Engineering and Consulting
Disaggregation of Revenue [Line Items]
Revenue	17,970	17,708	34,922	34,787
Engineering and Consulting | Domestic
Disaggregation of Revenue [Line Items]
Revenue	17,970	17,708	34,922	34,787
Commercial
Disaggregation of Revenue [Line Items]
Revenue	8,177	8,388	17,744	15,413
Commercial | Energy
Disaggregation of Revenue [Line Items]
Revenue	6,701	7,016	14,790	12,944
Commercial | Engineering and Consulting
Disaggregation of Revenue [Line Items]
Revenue	1,476	1,372	2,954	2,469
Government
Disaggregation of Revenue [Line Items]
Revenue	46,199	29,956	80,011	59,439
Government | Energy
Disaggregation of Revenue [Line Items]
Revenue	29,861	13,675	48,220	27,229
Government | Engineering and Consulting
Disaggregation of Revenue [Line Items]
Revenue	16,338	16,281	31,791	32,210
Utilities
Disaggregation of Revenue [Line Items]
Revenue	48,270	45,811	96,728	88,388
Utilities | Energy
Disaggregation of Revenue [Line Items]
Revenue	48,114	45,756	96,551	88,280
Utilities | Engineering and Consulting
Disaggregation of Revenue [Line Items]
Revenue	156	55	177	108
Time-and-materials
Disaggregation of Revenue [Line Items]
Revenue	20,927	22,919	42,746	43,240
Time-and-materials | Energy
Disaggregation of Revenue [Line Items]
Revenue	7,587	9,056	16,405	15,956
Time-and-materials | Engineering and Consulting
Disaggregation of Revenue [Line Items]
Revenue	13,340	13,863	26,341	27,284
Unit-based
Disaggregation of Revenue [Line Items]
Revenue	46,299	44,326	92,240	86,385
Unit-based | Energy
Disaggregation of Revenue [Line Items]
Revenue	42,544	41,604	85,501	81,218
Unit-based | Engineering and Consulting
Disaggregation of Revenue [Line Items]
Revenue	3,755	2,722	6,739	5,167
Fixed price
Disaggregation of Revenue [Line Items]
Revenue	35,419	16,909	59,497	33,615
Fixed price | Energy
Disaggregation of Revenue [Line Items]
Revenue	34,545	15,786	57,655	31,279
Fixed price | Engineering and Consulting
Disaggregation of Revenue [Line Items]
Revenue	$ 874	$ 1,123	$ 1,842	$ 2,336

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: