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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 2,891 shares of Common Stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 15,000 shares of restricted stock that vest in three substantially equal installments on each of June 10, 2021, June 10, 2022 and June 10, 2023, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":21893,"source":{"system":"sec-edgar","filing":"0001179110-21-006632","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000117911021006632/edgar.xml","form_type":"4"}},{"id":2774273,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":135608,"kind":"person","name":"Procell Adam C","position":1,"cik":"0001588202","reported_name":"Procell Adam C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Strategy Officer"}}],"security":"Common Stock","published_at":"2021-03-23T22:11:38.000Z","date":"2021-03-16","kind":"sale","acquired":false,"shares":11,"price":45.97,"value":505.67,"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 performance-based restricted stock units on March 10, 2021."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 15,000 shares of restricted stock that vest in three equal installments on each of June 10, 2021, June 10, 2022 and June 10, 2023, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":19002,"source":{"system":"sec-edgar","filing":"0001179110-21-003738","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000117911021003738/edgar.xml","form_type":"4"}},{"id":2774272,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":135608,"kind":"person","name":"Procell Adam C","position":1,"cik":"0001588202","reported_name":"Procell Adam C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Strategy Officer"}}],"security":"Common Stock","published_at":"2021-03-23T22:11:38.000Z","date":"2021-03-15","kind":"sale","acquired":false,"shares":25,"price":47.09,"value":1177.25,"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 performance-based restricted stock units on March 10, 2021."},{"field":"price","element":"transactionPricePerShare","label":"F12","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $46.84 to $47.80, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 15,000 shares of restricted stock that vest in three equal installments on each of June 10, 2021, June 10, 2022 and June 10, 2023, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":19013,"source":{"system":"sec-edgar","filing":"0001179110-21-003738","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000117911021003738/edgar.xml","form_type":"4"}},{"id":2774271,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":135608,"kind":"person","name":"Procell Adam C","position":1,"cik":"0001588202","reported_name":"Procell Adam C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Strategy Officer"}}],"security":"Common Stock","published_at":"2021-03-23T22:11:38.000Z","date":"2021-03-15","kind":"sale","acquired":false,"shares":289,"price":46.37,"value":13400.93,"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 performance-based restricted stock units on March 10, 2021."},{"field":"price","element":"transactionPricePerShare","label":"F11","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $45.84 to $46.67, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 15,000 shares of restricted stock that vest in three equal installments on each of June 10, 2021, June 10, 2022 and June 10, 2023, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":19038,"source":{"system":"sec-edgar","filing":"0001179110-21-003738","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000117911021003738/edgar.xml","form_type":"4"}},{"id":2774270,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":135608,"kind":"person","name":"Procell Adam C","position":1,"cik":"0001588202","reported_name":"Procell Adam C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Strategy Officer"}}],"security":"Common Stock","published_at":"2021-03-23T22:11:38.000Z","date":"2021-03-12","kind":"sale","acquired":false,"shares":8,"price":50.55,"value":404.4,"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 performance-based restricted stock units on March 10, 2021."},{"field":"price","element":"transactionPricePerShare","label":"F10","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $50.28 to $50.76, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 15,000 shares of restricted stock that vest in three equal installments on each of June 10, 2021, June 10, 2022 and June 10, 2023, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":19327,"source":{"system":"sec-edgar","filing":"0001179110-21-003738","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000117911021003738/edgar.xml","form_type":"4"}},{"id":2774269,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":135608,"kind":"person","name":"Procell Adam C","position":1,"cik":"0001588202","reported_name":"Procell Adam C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Strategy Officer"}}],"security":"Common Stock","published_at":"2021-03-23T22:11:38.000Z","date":"2021-03-12","kind":"sale","acquired":false,"shares":29,"price":49.62,"value":1438.98,"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 performance-based restricted stock units on March 10, 2021."},{"field":"price","element":"transactionPricePerShare","label":"F9","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $49.23 to $50.20, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 15,000 shares of restricted stock that vest in three equal installments on each of June 10, 2021, June 10, 2022 and June 10, 2023, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":19335,"source":{"system":"sec-edgar","filing":"0001179110-21-003738","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000117911021003738/edgar.xml","form_type":"4"}},{"id":2774268,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":135608,"kind":"person","name":"Procell Adam C","position":1,"cik":"0001588202","reported_name":"Procell Adam C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Strategy Officer"}}],"security":"Common Stock","published_at":"2021-03-23T22:11:38.000Z","date":"2021-03-12","kind":"sale","acquired":false,"shares":51,"price":48.59,"value":2478.09,"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 performance-based restricted stock units on March 10, 2021."},{"field":"price","element":"transactionPricePerShare","label":"F8","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $48.12 to $49.00, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 15,000 shares of restricted stock that vest in three equal installments on each of June 10, 2021, June 10, 2022 and June 10, 2023, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":19364,"source":{"system":"sec-edgar","filing":"0001179110-21-003738","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000117911021003738/edgar.xml","form_type":"4"}},{"id":2774267,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":135608,"kind":"person","name":"Procell Adam C","position":1,"cik":"0001588202","reported_name":"Procell Adam C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Strategy Officer"}}],"security":"Common Stock","published_at":"2021-03-23T22:11:38.000Z","date":"2021-03-12","kind":"sale","acquired":false,"shares":53,"price":47.61,"value":2523.33,"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 performance-based restricted stock units on March 10, 2021."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $47.05 to $47.97, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 15,000 shares of restricted stock that vest in three equal installments on each of June 10, 2021, June 10, 2022 and June 10, 2023, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":19415,"source":{"system":"sec-edgar","filing":"0001179110-21-003738","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000117911021003738/edgar.xml","form_type":"4"}},{"id":2774266,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":135608,"kind":"person","name":"Procell Adam C","position":1,"cik":"0001588202","reported_name":"Procell Adam C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Strategy Officer"}}],"security":"Common Stock","published_at":"2021-03-23T22:11:38.000Z","date":"2021-03-12","kind":"sale","acquired":false,"shares":92,"price":46.47,"value":4275.24,"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 performance-based restricted stock units on March 10, 2021."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $45.91 to $46.87, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 15,000 shares of restricted stock that vest in three equal installments on each of June 10, 2021, June 10, 2022 and June 10, 2023, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":19468,"source":{"system":"sec-edgar","filing":"0001179110-21-003738","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000117911021003738/edgar.xml","form_type":"4"}},{"id":2774265,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":135608,"kind":"person","name":"Procell Adam C","position":1,"cik":"0001588202","reported_name":"Procell Adam C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Strategy Officer"}}],"security":"Common Stock","published_at":"2021-03-23T22:11:38.000Z","date":"2021-03-11","kind":"sale","acquired":false,"shares":99,"price":47.62,"value":4714.38,"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 of performance-based restricted stock units on March 10, 2021."},{"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 $47.05 to $47.89, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 15,000 shares of restricted stock that vest in three equal installments on each of June 10, 2021, June 10, 2022 and June 10, 2023, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":19560,"source":{"system":"sec-edgar","filing":"0001179110-21-003738","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000117911021003738/edgar.xml","form_type":"4"}},{"id":2774264,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":135608,"kind":"person","name":"Procell Adam C","position":1,"cik":"0001588202","reported_name":"Procell Adam C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Strategy Officer"}}],"security":"Common Stock","published_at":"2021-03-23T22:11:38.000Z","date":"2021-03-11","kind":"sale","acquired":false,"shares":74,"price":45.97,"value":3401.78,"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 performance-based restricted stock units on March 10, 2021."},{"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 $46.00 to $46.99, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 15,000 shares of restricted stock that vest in three equal installments on each of June 10, 2021, June 10, 2022 and June 10, 2023, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":19659,"source":{"system":"sec-edgar","filing":"0001179110-21-003738","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000117911021003738/edgar.xml","form_type":"4"}},{"id":2774263,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":135608,"kind":"person","name":"Procell Adam C","position":1,"cik":"0001588202","reported_name":"Procell Adam C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Strategy Officer"}}],"security":"Common Stock","published_at":"2021-03-23T22:11:38.000Z","date":"2021-03-11","kind":"sale","acquired":false,"shares":52,"price":45.54,"value":2368.08,"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 performance-based restricted stock units on March 10, 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 $44.97 to $45.95, 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 footnotes (4) through (12)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 15,000 shares of restricted stock that vest in three equal installments on each of June 10, 2021, June 10, 2022 and June 10, 2023, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":19733,"source":{"system":"sec-edgar","filing":"0001179110-21-003738","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000117911021003738/edgar.xml","form_type":"4"}},{"id":2791369,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":135608,"kind":"person","name":"Procell Adam C","position":1,"cik":"0001588202","reported_name":"Procell Adam C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2021-03-12T22:36:04.000Z","date":"2021-03-10","kind":"grant","acquired":true,"shares":1966,"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 2, 2020. The performance conditions applicable to the award were determined to have been satisfied by the Issuer's Compensation Committee on March 10, 2021, resulting in the immediate vesting of the restricted stock units as to 1,966 shares of Common Stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes an aggregate of 313 shares of Common Stock purchased under the Amended and Restated Willdan Group, Inc. 2006 Employee Stock Purchase Plan including 131 shares on June 30, 2020 and 182 shares on December 31, 2020. Also includes 15,000 shares of restricted stock that vest in three equal installments on each of June 10, 2021, June 10, 2022 and June 10, 2023, subject to the Reporting Person's continued service to the Issuer through the applicable vesting date."}],"balance_after":19785,"source":{"system":"sec-edgar","filing":"0001179110-21-003377","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000117911021003377/edgar.xml","form_type":"4"}},{"id":3102860,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":135608,"kind":"person","name":"Procell Adam C","position":1,"cik":"0001588202","reported_name":"Procell Adam C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2020-06-22T22:49:32.000Z","date":"2020-06-19","kind":"sale","acquired":false,"shares":1700,"price":23.52,"value":39984.0,"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 performance-based restricted stock units on June 10, 2020."},{"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 $23.50 to $24.01, 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 range set forth above."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 15,000 shares of restricted stock that vest in three equal installments on each of June 11, 2021, June 11, 2022 and June 11, 2023, subject to the reporting person's continued service to the Issuer through the applicable vesting date."}],"balance_after":17506,"source":{"system":"sec-edgar","filing":"0001179110-20-007687","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000117911020007687/edgar.xml","form_type":"4"}},{"id":3110175,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":135608,"kind":"person","name":"Procell Adam C","position":1,"cik":"0001588202","reported_name":"Procell Adam C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Chief Strategy Officer"}}],"security":"Common Stock","published_at":"2020-06-16T01:01:11.000Z","date":"2020-06-11","kind":"grant","acquired":true,"shares":15000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The shares of restricted stock vest in three equal installments on each of June 11, 2021, June 11, 2022 and June 11, 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 15,000 shares of restricted stock that vest in three equal installments on each of June 11, 2021, June 11, 2022 and June 11, 2023, subject to the reporting person's continued service to the Issuer through the applicable vesting date."}],"balance_after":19206,"source":{"system":"sec-edgar","filing":"0001104659-20-073516","document":"a4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000110465920073516/a4.xml","form_type":"4"}}]}