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Cover
Dec. 08, 2023
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Dec. 08, 2023
Entity File Number 001-33076
Entity Registrant Name WILLDAN GROUP, INC.
Entity Central Index Key 0001370450
Entity Tax Identification Number 14-1951112
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 2401 East Katella Avenue
Entity Address, Address Line Two Suite 300
Entity Address, City or Town Anaheim
Entity Address, State or Province CA
Entity Address, Postal Zip Code 92806
City Area Code 800
Local Phone Number 424-9144
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, par value $0.01 per share
Trading Symbol WLDN
Security Exchange Name NASDAQ
Entity Emerging Growth Company false