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The reporting person undertakes to provide to Willdan Group, Inc., any security holder of Willdan Group, Inc., or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within ranges set forth in this footnote."}],"balance_after":57938,"source":{"system":"sec-edgar","filing":"0001179110-17-009225","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000117911017009225/edgar.xml","form_type":"4"}},{"id":4285158,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":138350,"kind":"person","name":"Holdsworth Raymond W Jr","position":1,"cik":"0001385711","reported_name":"Holdsworth Raymond W Jr","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2017-06-12T17:29:52.000Z","date":"2017-06-08","kind":"grant","acquired":true,"shares":1474,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The shares vest in three substantially equal installments on each of June 8, 2018, June 8, 2019 and June 8, 2020."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 1,200 shares of restricted stock that vest on June 5, 2018 and 4,583 shares of restricted stock that vest in three substantially equal parts on each of June 9, 2017, June 9, 2018 and June 9, 2019."}],"balance_after":8469,"source":{"system":"sec-edgar","filing":"0001179110-17-008867","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000117911017008867/edgar.xml","form_type":"4"}},{"id":4324393,"issuer":{"id":4758,"kind":"organization","name":"Willdan Group, Inc.","symbol":"WLDN"},"owners":[{"id":138350,"kind":"person","name":"Holdsworth Raymond W Jr","position":1,"cik":"0001385711","reported_name":"Holdsworth Raymond W Jr","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2017-05-11T20:00:24.000Z","date":"2017-05-09","kind":"purchase","acquired":true,"shares":1000,"price":31.7,"value":31700.0,"ownership":{"direct":false,"nature":"By The Holdsworth Family Trust"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"The Form 4 has been updated to reflect that 56,188 shares that were previously reported as directly owned are held by the reporting person through his trust."}],"balance_after":57188,"source":{"system":"sec-edgar","filing":"0001179110-17-007068","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1370450/000117911017007068/edgar.xml","form_type":"4"}}]}