v2.4.0.8
Document and Entity Information
6 Months Ended
Jun. 27, 2014
Aug. 04, 2014
Document and Entity Information    
Entity Registrant Name Willdan Group, Inc.  
Entity Central Index Key 0001370450  
Document Type 10-Q  
Document Period End Date Jun. 27, 2014  
Amendment Flag false  
Current Fiscal Year End Date --01-02  
Entity Current Reporting Status Yes  
Entity Filer Category Smaller Reporting Company  
Entity Common Stock, Shares Outstanding   7,514,284
Document Fiscal Year Focus 2014  
Document Fiscal Period Focus Q2