ORGANIZATION AND OPERATIONS OF THE COMPANY	12 Months Ended
ORGANIZATION AND OPERATIONS OF THE COMPANY	Jan. 02, 2015
ORGANIZATION AND OPERATIONS OF THE COMPANY
ORGANIZATION AND OPERATIONS OF THE COMPANY	1. ORGANIZATION AND OPERATIONS OF THE COMPANY Nature of Business Willdan Group, Inc. and subsidiaries ("Willdan Group" or the "Company") is a provider of professional technical and consulting services, including comprehensive energy efficiency solutions, for utilities, private industry, and public agencies at all levels of government, primarily in California and New York. The Company also has operations in Arizona, Florida, Texas, Washington and Washington, D.C. The Company enables these entities to provide a wide range of specialized services without having to incur and maintain the overhead necessary to develop staffing in-house. The Company provides a broad range of complementary services including energy efficiency, engineering and planning, economic and financial consulting, and national preparedness and interoperability. The Company's clients primarily consist of public and governmental agencies, including cities, counties, public utilities, redevelopment agencies, water districts, school districts and universities, state agencies, federal agencies, a variety of other special districts and agencies, private utilities and industry and tribal governments.

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.