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The performance conditions applicable to the award were determined to have been satisfied by the Issuer's Compensation Committee effective on March 25, 2026, resulting in the immediate vesting of the restricted stock units as to 3,780 shares of Common Stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 5,625 shares of restricted stock units that vest in three substantially equal installments on each of March 3, 2027, March 3, 2028 and March 3, 2029, (ii) 3,080 shares of restricted stock units that vest in two substantially equal installments on each of March 17, 2027 and March 17, 2028, and (iii) 1,400 shares of restricted stock units that vest on March 20, 2027, subject to the Reporting Person's continued service to the Issuer through the applicable vesting 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These shares were sold in multiple transactions at prices ranging from $53.23 to $53.42, inclusive. The Reporting Person undertakes to provide to Willdan Group, Inc., any security holder of Willdan Group, Inc., 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":"F1","text":"Includes (i) 4,620 shares of restricted stock units that vest in three substantially equal installments on each of March 17, 2026, March 17, 2027 and March 17, 2028, (ii) 2,800 shares of restricted stock units that vest in two substantially equal installments on each of March 20, 2026 and March 20, 2027 and (iii) 7,600 shares of restricted stock that vest on March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting 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The performance conditions applicable to the award were determined to have been satisfied by the Issuer's Compensation Committee effective on March 24, 2025, resulting in the immediate vesting of the restricted stock units as to 3,780 shares of Common Stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 4,620 shares of restricted stock units that vest in three substantially equal installments on each of March 17, 2026, March 17, 2027 and March 17, 2028, (ii) 2,800 shares of restricted stock units that vest in two substantially equal installments on each of March 20, 2026 and March 20, 2027 and (iii) 7,600 shares of restricted stock that vest on March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting 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performance-based restricted stock units previously granted to the Reporting Person by the Issuer on March 7, 2023. The performance conditions applicable to the award were determined to have been satisfied by the Issuer's Compensation Committee effective on  March 11, 2025, resulting in the immediate vesting of the restricted stock units as to 2,520 shares of Common Stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 4,200 shares of restricted stock units that vest in three substantially equal installments on each of March 20, 2025, March 20, 2026 and March 20, 2027 and (ii) 7,600 shares of restricted stock that vest on March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":67814,"source":{"system":"sec-edgar","filing":"0001415889-25-007899","document":"form4-03122025_100324.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588925007899/form4-03122025_100324.xml","form_type":"4"}},{"id":1213489,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EXECUTIVE VP AND CFO"}}],"security":"Common Stock","published_at":"2025-03-11T17:37:34.000Z","date":"2025-03-07","kind":"tax_withholding","planned":false,"acquired":false,"shares":4224,"price":41.8,"value":176563.2,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares of the Issuer's Common Stock withheld to satisfy tax withholding obligations in connection with the vesting of restricted stock on March 7, 2025, which restricted stock was granted on March 7, 2023 and March 7, 2024."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 372 shares of Common Stock purchased under the Amended and Restated Willdan Group, Inc. 2006 Employee Stock Purchase Plan on December 31, 2024."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes (i) 4,200 shares of restricted stock units that vest in three substantially equal installments on each of March 20, 2025, March 20, 2026 and March 20, 2027 and (ii) 7,600 shares of restricted stock that vest on March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":65294,"source":{"system":"sec-edgar","filing":"0001415889-25-007689","document":"form4-03112025_090331.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588925007689/form4-03112025_090331.xml","form_type":"4"}},{"id":1337981,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EXECUTIVE VP AND CFO"}}],"security":"Stock Options (Right to Buy)","published_at":"2024-12-10T17:38:21.000Z","date":"2024-12-09","kind":"exercise","planned":false,"acquired":false,"shares":4349,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"Stock options granted under the Willdan Group, Inc. 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These shares were sold in multiple transactions at prices ranging from $43.00 to $43.42, inclusive. The Reporting Person undertakes to provide to Willdan Group, Inc., any security holder of Willdan Group, Inc., 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":"F1","text":"Includes (i) 4,200 shares of restricted stock units that vest in three substantially equal installments on each of March 20, 2025, March 20, 2026 and March 20, 2027 and (ii) 15,200 shares of restricted stock that vest in two substantially equal installments on each of March 7, 2025 and March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting 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performance-based restricted stock units previously granted to the Reporting Person by the Issuer on August 2, 2022. The performance conditions applicable to the award were determined to have been satisfied by the Issuer's Compensation Committee on July 30, 2024, resulting in the immediate vesting of the restricted stock units as to 1,736 shares of Common Stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 4,200 shares of restricted stock units that vest in three substantially equal installments on each of March 20, 2025, March 20, 2026 and March 20, 2027 and (ii) 15,200 shares of restricted stock that vest in two substantially equal installments on each of March 7, 2025 and March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":70078,"source":{"system":"sec-edgar","filing":"0001415889-24-021845","document":"form4-08212024_090811.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588924021845/form4-08212024_090811.xml","form_type":"4"}},{"id":1438136,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EXECUTIVE VP AND CFO"}}],"security":"Stock Options (Right to Buy)","published_at":"2024-08-08T17:41:53.000Z","date":"2024-08-07","kind":"exercise","planned":false,"acquired":false,"shares":10000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"Stock options granted under the Willdan Group, Inc. Amended and Restated 2008 Performance Incentive Plan, which vested in three equal installments on each of December 7, 2016, December 7, 2017 and December 7, 2018."}],"balance_after":6039,"derivative":{"exercise_price":9.08,"exercise_date":"2016-12-07","expiration_date":"2025-12-07","underlying":"Common Stock","underlying_shares":10000},"source":{"system":"sec-edgar","filing":"0001415889-24-020999","document":"form4-08082024_090849.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588924020999/form4-08082024_090849.xml","form_type":"4"}},{"id":1438135,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EXECUTIVE VP AND CFO"}}],"security":"Common Stock","published_at":"2024-08-08T17:41:53.000Z","date":"2024-08-07","kind":"sale","planned":false,"acquired":false,"shares":196,"price":37.15,"value":7281.4,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $37.00 to $37.30, inclusive. The Reporting Person undertakes to provide to Willdan Group, Inc., any security holder of Willdan Group, Inc., 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":"F1","text":"Includes (i) 4,200 shares of restricted stock units that vest in three substantially equal installments on each of March 20, 2025, March 20, 2026 and March 20, 2027 and (ii) 15,200 shares of restricted stock that vest in two substantially equal installments on each of March 7, 2025 and March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 659 shares of Common Stock purchased under the Amended and Restated Willdan Group, Inc. 2006 Employee Stock Purchase Plan on June 30, 2024."}],"balance_after":68342,"source":{"system":"sec-edgar","filing":"0001415889-24-020999","document":"form4-08082024_090849.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588924020999/form4-08082024_090849.xml","form_type":"4"}},{"id":1438134,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EXECUTIVE VP AND CFO"}}],"security":"Common Stock","published_at":"2024-08-08T17:41:53.000Z","date":"2024-08-07","kind":"sale","planned":false,"acquired":false,"shares":9804,"price":36.44,"value":357257.76,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $36.00 to $36.97, inclusive. The Reporting Person undertakes to provide to Willdan Group, Inc., any security holder of Willdan Group, Inc., 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":"F1","text":"Includes (i) 4,200 shares of restricted stock units that vest in three substantially equal installments on each of March 20, 2025, March 20, 2026 and March 20, 2027 and (ii) 15,200 shares of restricted stock that vest in two substantially equal installments on each of March 7, 2025 and March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 659 shares of Common Stock purchased under the Amended and Restated Willdan Group, Inc. 2006 Employee Stock Purchase Plan on June 30, 2024."}],"balance_after":68538,"source":{"system":"sec-edgar","filing":"0001415889-24-020999","document":"form4-08082024_090849.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588924020999/form4-08082024_090849.xml","form_type":"4"}},{"id":1438133,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EXECUTIVE VP AND CFO"}}],"security":"Common 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The performance conditions applicable to the award were determined to have been satisfied by the Issuer's Compensation Committee on March 20, 2024, resulting in the immediate vesting of the restricted stock units as to 2,520 shares of Common Stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 4,200 shares of restricted stock units that vest in three substantially equal installments on each of March 20, 2025, March 20, 2026 and March 20, 2027 and (ii) 15,200 shares of restricted stock that vest in two substantially equal installments on each of March 7, 2025 and March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting 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of restricted stock units awarded to the Reporting Person by the Issuer on March 20, 2024, which vest in three substantially equal installments on each of March 20, 2025, March 20, 2026 and March 20, 2027, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 4,200 shares of restricted stock units that vest in three substantially equal installments on each of March 20, 2025, March 20, 2026 and March 20, 2027 and (ii) 15,200 shares of restricted stock that vest in two substantially equal installments on each of March 7, 2025 and March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting 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Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":62317,"source":{"system":"sec-edgar","filing":"0001415889-24-007540","document":"form4-03112024_100359.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588924007540/form4-03112024_100359.xml","form_type":"4"}},{"id":1795577,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VICE PRESIDENT AND CFO"}}],"security":"Common 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These shares were sold in multiple transactions at prices ranging from $24.68 to $24.75, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 22,800 shares of restricted stock that vest in three substantially equal installments on each of March 7, 2024, March 7, 2025 and March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":66042,"source":{"system":"sec-edgar","filing":"0001415889-23-012726","document":"form4-08282023_100809.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588923012726/form4-08282023_100809.xml","form_type":"4"}},{"id":1795576,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VICE PRESIDENT AND CFO"}}],"security":"Common Stock","published_at":"2023-08-28T18:21:20.000Z","date":"2023-08-24","kind":"sale","planned":false,"acquired":false,"shares":257,"price":24.34,"value":6255.38,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares of Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting\nof the performance-based restricted stock units on August 21, 2023."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $23.67 to $24.65,\ninclusive. 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 (2) and footnote (4)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 22,800 shares of restricted stock that vest in three substantially equal installments on each of March 7, 2024, March 7, 2025 and March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":66057,"source":{"system":"sec-edgar","filing":"0001415889-23-012726","document":"form4-08282023_100809.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588923012726/form4-08282023_100809.xml","form_type":"4"}},{"id":1798114,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VICE PRESIDENT AND CFO"}}],"security":"Common Stock","published_at":"2023-08-24T17:36:52.000Z","date":"2023-08-23","kind":"sale","planned":false,"acquired":false,"shares":133,"price":23.81,"value":3166.73,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares of Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of the performance-based restricted stock units on August 21, 2023."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $23.65 to $24.15, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 22,800 shares of restricted stock that vest in three substantially equal installments on each of March 7, 2024, March 7, 2025 and March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":66314,"source":{"system":"sec-edgar","filing":"0001415889-23-012612","document":"form4-08242023_090845.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588923012612/form4-08242023_090845.xml","form_type":"4"}},{"id":1798113,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VICE PRESIDENT AND CFO"}}],"security":"Common Stock","published_at":"2023-08-24T17:36:52.000Z","date":"2023-08-23","kind":"sale","planned":false,"acquired":false,"shares":179,"price":23.29,"value":4168.91,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares of Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of the performance-based restricted stock units on August 21, 2023."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $22.65 to $23.64, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 22,800 shares of restricted stock that vest in three substantially equal installments on each of March 7, 2024, March 7, 2025 and March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":66447,"source":{"system":"sec-edgar","filing":"0001415889-23-012612","document":"form4-08242023_090845.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588923012612/form4-08242023_090845.xml","form_type":"4"}},{"id":1798112,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VICE PRESIDENT AND CFO"}}],"security":"Common Stock","published_at":"2023-08-24T17:36:52.000Z","date":"2023-08-22","kind":"sale","planned":false,"acquired":false,"shares":324,"price":22.82,"value":7393.68,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares of Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of the performance-based restricted stock units on August 21, 2023."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $22.60 to $23.09, 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 (2), footnote (4) and footnote (5)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 22,800 shares of restricted stock that vest in three substantially equal installments on each of March 7, 2024, March 7, 2025 and March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":66626,"source":{"system":"sec-edgar","filing":"0001415889-23-012612","document":"form4-08242023_090845.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588923012612/form4-08242023_090845.xml","form_type":"4"}},{"id":1800096,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VICE PRESIDENT AND CFO"}}],"security":"Common Stock","published_at":"2023-08-22T18:07:17.000Z","date":"2023-08-21","kind":"grant","planned":false,"acquired":true,"shares":1736,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents performance-based restricted stock units previously granted to the Reporting Person by the Issuer on August 2, 2022. The performance conditions applicable to the award were determined to have been satisfied by the Issuer's Compensation Committee on August 21, 2023, resulting in the immediate vesting of the restricted stock units as to 1,736 shares of Common Stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 22,800 shares of restricted stock that vest in three substantially equal installments on each of March 7, 2024, March 7, 2025 and March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 715 shares of Common Stock purchased under the Amended and Restated Willdan Group, Inc. 2006 Employee Stock Purchase Plan on June 30, 2023."}],"balance_after":66950,"source":{"system":"sec-edgar","filing":"0001415889-23-012506","document":"form4-08222023_100811.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588923012506/form4-08222023_100811.xml","form_type":"4"}},{"id":1955307,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VICE PRESIDENT AND CFO"}}],"security":"Common Stock","published_at":"2023-03-14T20:12:05.000Z","date":"2023-03-13","kind":"sale","acquired":false,"shares":309,"price":16.77,"value":5181.93,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $16.54 to $17.04, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 22,800 shares of restricted stock that vest in three substantially equal installments on each of March 7, 2024, March 7, 2025 and March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":64499,"source":{"system":"sec-edgar","filing":"0001415889-23-004909","document":"form4-03152023_120357.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588923004909/form4-03152023_120357.xml","form_type":"4"}},{"id":1955306,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VICE PRESIDENT AND CFO"}}],"security":"Common Stock","published_at":"2023-03-14T20:12:05.000Z","date":"2023-03-13","kind":"sale","acquired":false,"shares":496,"price":16.15,"value":8010.4,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $15.53 to $16.52, 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 (2) and footnote (4)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 22,800 shares of restricted stock that vest in three substantially equal installments on each of March 7, 2024, March 7, 2025 and March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":64808,"source":{"system":"sec-edgar","filing":"0001415889-23-004909","document":"form4-03152023_120357.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588923004909/form4-03152023_120357.xml","form_type":"4"}},{"id":1957434,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VICE PRESIDENT AND CFO"}}],"security":"Common Stock","published_at":"2023-03-13T18:51:21.000Z","date":"2023-03-10","kind":"sale","acquired":false,"shares":73,"price":16.96,"value":1238.08,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $16.60 to $17.00, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 22,800 shares of restricted stock that vest in three substantially equal installments on each of March 7, 2024, March 7, 2025 and March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":65304,"source":{"system":"sec-edgar","filing":"0001415889-23-004813","document":"form4-03132023_100307.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588923004813/form4-03132023_100307.xml","form_type":"4"}},{"id":1957433,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VICE PRESIDENT AND CFO"}}],"security":"Common Stock","published_at":"2023-03-13T18:51:21.000Z","date":"2023-03-10","kind":"sale","acquired":false,"shares":328,"price":15.78,"value":5175.84,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $15.56 to $16.53, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 22,800 shares of restricted stock that vest in three substantially equal installments on each of March 7, 2024, March 7, 2025 and March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":65377,"source":{"system":"sec-edgar","filing":"0001415889-23-004813","document":"form4-03132023_100307.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588923004813/form4-03132023_100307.xml","form_type":"4"}},{"id":1957432,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VICE PRESIDENT AND CFO"}}],"security":"Common Stock","published_at":"2023-03-13T18:51:21.000Z","date":"2023-03-10","kind":"sale","acquired":false,"shares":369,"price":15.21,"value":5612.49,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $14.55 to $15.53, 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 (2), footnote (4) and footnote (5)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 22,800 shares of restricted stock that vest in three substantially equal installments on each of March 7, 2024, March 7, 2025 and March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":65705,"source":{"system":"sec-edgar","filing":"0001415889-23-004813","document":"form4-03132023_100307.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588923004813/form4-03132023_100307.xml","form_type":"4"}},{"id":1959607,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VICE PRESIDENT AND CFO"}}],"security":"Common Stock","published_at":"2023-03-10T18:03:45.000Z","date":"2023-03-09","kind":"sale","acquired":false,"shares":828,"price":17.03,"value":14100.84,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares of the Issuer's Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on March 8, 2023, which restricted stock was granted on March 8, 2022."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $16.90 to $17.35, 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 range set forth in this footnote."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 22,800 shares of restricted stock that vest in three substantially equal installments on each of March 7, 2024, March 7, 2025 and March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":66074,"source":{"system":"sec-edgar","filing":"0001415889-23-004683","document":"form4-03102023_110333.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588923004683/form4-03102023_110333.xml","form_type":"4"}},{"id":1964188,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VICE PRESIDENT AND CFO"}}],"security":"Common Stock","published_at":"2023-03-08T18:43:48.000Z","date":"2023-03-07","kind":"grant","acquired":true,"shares":22800,"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 March 7, 2023, which vest in three substantially equal installments on each of March 7, 2024, March 7, 2025 and March 7, 2026, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 440 shares of Common Stock purchased under the Amended and Restated Willdan Group, Inc. 2006 Employee Stock Purchase Plan on December 31, 2022."}],"balance_after":66902,"source":{"system":"sec-edgar","filing":"0001415889-23-004545","document":"form4-03082023_110340.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588923004545/form4-03082023_110340.xml","form_type":"4"}},{"id":2084375,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VICE PRESIDENT AND CFO"}}],"security":"Common Stock","published_at":"2022-12-16T18:01:54.000Z","date":"2022-12-15","kind":"sale","acquired":false,"shares":299,"price":16.72,"value":4999.28,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares of Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on December 11, 2022."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $16.60 to $16.85, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Include 3,800 shares of restricted stock that vest on March 8, 2023, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":43662,"source":{"system":"sec-edgar","filing":"0001415889-22-012645","document":"form4-12162022_111229.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588922012645/form4-12162022_111229.xml","form_type":"4"}},{"id":2084374,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VICE PRESIDENT AND CFO"}}],"security":"Common Stock","published_at":"2022-12-16T18:01:54.000Z","date":"2022-12-14","kind":"sale","acquired":false,"shares":354,"price":16.57,"value":5865.78,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares of Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock on December 11, 2022."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $16.31 to $16.84, 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  (2) and footnote (4)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Include 3,800 shares of restricted stock that vest on March 8, 2023, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":43961,"source":{"system":"sec-edgar","filing":"0001415889-22-012645","document":"form4-12162022_111229.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588922012645/form4-12162022_111229.xml","form_type":"4"}},{"id":2086963,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VICE PRESIDENT AND CFO"}}],"security":"Common Stock","published_at":"2022-12-14T18:34:53.000Z","date":"2022-12-12","kind":"sale","acquired":false,"shares":294,"price":16.25,"value":4777.5,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares of Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of the restricted stock on December 11, 2022."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $16.01 to $16.52, 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":"F3","text":"Include 3,800 shares of restricted stock that vest on March 8, 2023, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Includes 383 shares of Common Stock purchased under the Amended and Restated Willdan Group, Inc. 2006 Employee Stock Purchase Plan on June 30, 2022."}],"balance_after":44315,"source":{"system":"sec-edgar","filing":"0001415889-22-012563","document":"form4-12142022_111233.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588922012563/form4-12142022_111233.xml","form_type":"4"}},{"id":2314510,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VICE PRESIDENT AND CFO"}}],"security":"Common Stock","published_at":"2022-03-30T17:35:15.000Z","date":"2022-03-28","kind":"tax_withholding","acquired":false,"shares":567,"price":30.84,"value":17486.28,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F5","text":"Represents shares of the Issuer's Common Stock withheld for tax withholding purposes in connection with the vesting of the performance-based restricted stock units referenced in footnote (3)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 2,000 shares of restricted stock that vest on December 11, 2022 and (ii) 3,800 shares of restricted stock that vest on March 8, 2023, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":44226,"source":{"system":"sec-edgar","filing":"0001415889-22-003482","document":"form4-03302022_020302.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588922003482/form4-03302022_020302.xml","form_type":"4"}},{"id":2314509,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VICE PRESIDENT AND CFO"}}],"security":"Common Stock","published_at":"2022-03-30T17:35:15.000Z","date":"2022-03-28","kind":"tax_withholding","acquired":false,"shares":520,"price":30.84,"value":16036.8,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Represents shares of the Issuer's Common Stock withheld for tax withholding purposes in connection with the vesting of the performance-based restricted stock units referenced in footnote (1)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 2,000 shares of restricted stock that vest on December 11, 2022 and (ii) 3,800 shares of restricted stock that vest on March 8, 2023, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":44793,"source":{"system":"sec-edgar","filing":"0001415889-22-003482","document":"form4-03302022_020302.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588922003482/form4-03302022_020302.xml","form_type":"4"}},{"id":2314508,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VICE PRESIDENT AND CFO"}}],"security":"Common Stock","published_at":"2022-03-30T17:35:15.000Z","date":"2022-03-28","kind":"grant","acquired":true,"shares":1075,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F3","text":"Represents performance-based restricted stock units previously granted to the Reporting Person by the Issuer on March 2, 2020. The performance conditions applicable to the award were determined to have been satisfied by the Issuer's Compensation Committee on March 28, 2022, resulting in the immediate vesting of the restricted stock units as to 1,075 shares of Common Stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 2,000 shares of restricted stock that vest on December 11, 2022 and (ii) 3,800 shares of restricted stock that vest on March 8, 2023, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":45313,"source":{"system":"sec-edgar","filing":"0001415889-22-003482","document":"form4-03302022_020302.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588922003482/form4-03302022_020302.xml","form_type":"4"}},{"id":2314507,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VICE PRESIDENT AND CFO"}}],"security":"Common Stock","published_at":"2022-03-30T17:35:15.000Z","date":"2022-03-28","kind":"grant","acquired":true,"shares":987,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents performance-based restricted stock units previously granted to the Reporting Person by the Issuer on March 6, 2018. The performance conditions applicable to the award were determined to have been satisfied by the Issuer's Compensation Committee on March 28, 2022, resulting in the immediate vesting of the restricted stock units as to 987 shares of Common Stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 2,000 shares of restricted stock that vest on December 11, 2022 and (ii) 3,800 shares of restricted stock that vest on March 8, 2023, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":44238,"source":{"system":"sec-edgar","filing":"0001415889-22-003482","document":"form4-03302022_020302.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588922003482/form4-03302022_020302.xml","form_type":"4"}},{"id":2329020,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VICE PRESIDENT AND CFO"}}],"security":"Common Stock","published_at":"2022-03-17T19:23:03.000Z","date":"2022-03-15","kind":"sale","acquired":false,"shares":7525,"price":28.19,"value":212129.75,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares of Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the\n vesting of the performance-based restricted stock units on March 14, 2022."}],"balance_after":43251,"source":{"system":"sec-edgar","filing":"0001415889-22-003149","document":"form4-03172022_040340.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588922003149/form4-03172022_040340.xml","form_type":"4"}},{"id":2329019,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VICE PRESIDENT AND CFO"}}],"security":"Common Stock","published_at":"2022-03-17T19:23:03.000Z","date":"2022-03-15","kind":"sale","acquired":false,"shares":699,"price":26.44,"value":18481.56,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares of Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the\n vesting of the performance-based restricted stock units on March 14, 2022."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $26.43 to $27.10, 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":"F3","text":"Includes (i) 2,000 shares of restricted stock that vest on December 11, 2022 and (ii) 3,800 shares of restricted stock that vest on March 8, 2023, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":50776,"source":{"system":"sec-edgar","filing":"0001415889-22-003149","document":"form4-03172022_040340.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588922003149/form4-03172022_040340.xml","form_type":"4"}},{"id":2331703,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VICE PRESIDENT AND CFO"}}],"security":"Common Stock","published_at":"2022-03-16T19:09:28.000Z","date":"2022-03-14","kind":"grant","acquired":true,"shares":13725,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents performance-based restricted stock units previously granted to the Reporting Person by the Issuer on March 9, 2021. The performance conditions applicable to the award were determined to have been satisfied by the Issuer's Compensation Committee on March 14, 2022, resulting in the immediate vesting of the restricted stock units as to 13,725 shares of Common Stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 2,000 shares of restricted stock that vest on December 11, 2022 and (ii) 3,800 shares of restricted stock that vest on March 8, 2023, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":51475,"source":{"system":"sec-edgar","filing":"0001415889-22-003074","document":"form4-03162022_040319.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588922003074/form4-03162022_040319.xml","form_type":"4"}},{"id":2340582,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VICE PRESIDENT AND CFO"}}],"security":"Common Stock","published_at":"2022-03-10T19:44:33.000Z","date":"2022-03-08","kind":"grant","acquired":true,"shares":3800,"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 March 8, 2022, which vests in one installment on March 8, 2023, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 2,000 shares of restricted stock that vest on December 11, 2022, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 343 shares of Common Stock purchased under the Amended and Restated Willdan Group, Inc. 2006 Employee Stock Purchase Plan on December 31, 2021."}],"balance_after":37750,"source":{"system":"sec-edgar","filing":"0001415889-22-002854","document":"form4-03102022_040323.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588922002854/form4-03102022_040323.xml","form_type":"4"}},{"id":2472257,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VICE PRESIDENT AND CFO"}}],"security":"Common Stock","published_at":"2021-12-15T20:20:15.000Z","date":"2021-12-14","kind":"sale","acquired":false,"shares":1369,"price":41.5,"value":56813.5,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares of Common Stock sold in the open market, the proceeds of which were used to pay the tax withholding obligations incurred upon the vesting of restricted stock units on December 11, 2021."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $41.03 to $41.80, 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":"F3","text":"Includes 2,000 shares of restricted stock that vest on December 11, 2022, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Includes 281 shares of Common Stock purchased under the Amended and Restated Willdan Group, Inc. 2006 Employee Stock Purchase Plan on June 30, 2021."}],"balance_after":33607,"source":{"system":"sec-edgar","filing":"0001415889-21-005970","document":"form4-12152021_051203.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/904702/000141588921005970/form4-12152021_051203.xml","form_type":"4"}},{"id":2672843,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Common Stock","published_at":"2021-06-11T19:01:41.000Z","date":"2021-06-09","kind":"tax_withholding","acquired":false,"shares":2001,"price":39.27,"value":78579.27,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F3","text":"Represents shares of the Issuer's Common Stock withheld for tax withholding purposes in connection with the vesting of the performance-based restricted stock units referenced in footnote (1)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 4,000 shares of restricted stock that vest in two equal installments on each of December 11, 2021 and December 11, 2022, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":34695,"source":{"system":"sec-edgar","filing":"0001179110-21-006629","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/904702/000117911021006629/edgar.xml","form_type":"4"}},{"id":2672842,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":55916,"kind":"person","name":"EARLY CREIGHTON K","position":1,"cik":"0000904702","reported_name":"EARLY CREIGHTON K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Common Stock","published_at":"2021-06-11T19:01:41.000Z","date":"2021-06-09","kind":"grant","acquired":true,"shares":5782,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents performance-based restricted stock units previously granted to the Reporting Person by the Issuer on June 13, 2019. The performance conditions applicable to the award were determined to have been satisfied by the Issuer's Compensation Committee on June 9, 2021, resulting in the immediate vesting of the restricted stock units as to 5,782 shares of Common Stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 4,000 shares of restricted stock that vest in two equal installments on each of December 11, 2021 and December 11, 2022, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":36696,"source":{"system":"sec-edgar","filing":"0001179110-21-006629","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/904702/000117911021006629/edgar.xml","form_type":"4"}}]}