AUSTIN, Texas--(BUSINESS WIRE)--Fitch Ratings assigns an 'AAA' rating to the following Denton Independent School District, Texas (the district) unlimited tax (ULT) bonds: --$170.8 million ULT school building bonds, series 2015-A. The 'AAA' rating on the bonds is based on a guaranty provided by the Texas Permanent School Fund (PSF), whose bond guaranty program is rated 'AAA' by Fitch. (For more information on the Texas Permanent School Fund see Fitch Affirms Texas PSF Rating at 'AAA'; Outlook St