This information is available through their website at www.goodwill.org. Their organization uses the following credo:
Goodwill Industries is all about people working.
We are one of the world’s largest nonprofit providers of education, training, and career services for people with disadvantages, such as welfare dependency, homelessness, and lack of education or work experience, as well as those with physical, mental and emotional disabilities. Last year, local Goodwills collectively provided employment and training services to more than 720,000 individuals. We believe that work has the power to transform lives by building self-confidence, independence, creativity, trust and friendships. Everyone deserves a chance to have these. Goodwill Industries will enhance the quality and dignity of life for individuals, families, and communities on a global basis, through the power of work, by eliminating barriers to opportunity for people with special needs, and by facilitating empowerment, self-help, and service through dedicated, autonomous local organizations.
More specifically, their tax records shows exactly how they spent their money. See: http://www.goodwill.org/c/document_library/get_file?repository_id=12&file_path=/Financial&file_name=IRS_990_2004.pdf , especially on page 22.