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These shares were sold in multiple transactions at prices ranging from $106.00 to $106.87, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (1)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 1,781 shares of restricted stock that vest on June 11, 2026 and (ii) 1,124 shares of restricted stock that vest on June 12, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":11330,"source":{"system":"sec-edgar","filing":"0001701806-25-000005","document":"form4-09222025_090957.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000170180625000005/form4-09222025_090957.xml","form_type":"4"}},{"id":1112989,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":36723,"kind":"person","name":"McGinn Dennis V","position":1,"cik":"0001701806","reported_name":"McGinn Dennis V","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-06-12T21:55:00.000Z","date":"2025-06-11","kind":"grant","planned":false,"acquired":true,"shares":1781,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares of restricted stock awarded to the Reporting Person by the Issuer on June 11, 2025, which vest on June 11, 2026."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 2,248 shares of restricted stock that vest in two substantially equal installments on each of June 12, 2025 and June 12, 2026."}],"balance_after":18628,"source":{"system":"sec-edgar","filing":"0001415889-25-017032","document":"form4-06122025_090657.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588925017032/form4-06122025_090657.xml","form_type":"4"}},{"id":1480303,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":36723,"kind":"person","name":"McGinn Dennis V","position":1,"cik":"0001701806","reported_name":"McGinn Dennis V","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common 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2025."}],"balance_after":16847,"source":{"system":"sec-edgar","filing":"0001415889-24-016736","document":"form4-06132024_100613.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588924016736/form4-06132024_100613.xml","form_type":"4"}},{"id":1860172,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":36723,"kind":"person","name":"McGinn Dennis V","position":1,"cik":"0001701806","reported_name":"McGinn Dennis V","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2023-06-09T22:05:15.000Z","date":"2023-06-07","kind":"grant","planned":false,"acquired":true,"shares":3585,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares of restricted stock awarded to the Reporting Person by the Issuer on June 7, 2023, which vest in two substantially equal installments on each of June 7, 2024 and June 7, 2025."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 1,295 shares of restricted stock that vest on June 9, 2024."}],"balance_after":14599,"source":{"system":"sec-edgar","filing":"0001415889-23-009532","document":"form4-06092023_100610.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588923009532/form4-06092023_100610.xml","form_type":"4"}},{"id":2235553,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":36723,"kind":"person","name":"McGinn Dennis V","position":1,"cik":"0001701806","reported_name":"McGinn Dennis V","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common 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These shares were sold in multiple transactions at prices ranging from $26.69 to $26.90, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 1,783 of restricted stock that vest in two substantially equal installments on each of June 9, 2022 and June 9, 2023, and (ii) 1,527 shares of restricted stock that vest June on 11, 2022."}],"balance_after":8425,"source":{"system":"sec-edgar","filing":"0001415889-22-006226","document":"form4-06072022_020658.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000141588922006226/form4-06072022_020658.xml","form_type":"4"}},{"id":2671450,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, 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11, 2022."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 983 shares of restricted stock that vest June 13, 2021 and (ii) 1,084 shares of restricted stock that vest on June 13, 2021."}],"balance_after":9642,"source":{"system":"sec-edgar","filing":"0001179110-20-007383","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000117911020007383/edgar.xml","form_type":"4"}},{"id":3487429,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":36723,"kind":"person","name":"McGinn Dennis V","position":1,"cik":"0001701806","reported_name":"McGinn Dennis V","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common 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