Combine first 3 ingredients in a large bowl; let stand 5 minutes. Stir in flours, olive oil, and salt to form a soft dough.
Turn dough out onto a surface lightly sprinkled with semolina flour; knead 5 minutes or until smooth and elastic. Shape dough into a ball, and place in a lightly greased bowl, turning to grease top. Cover and let rise in a warm place (85°), free from drafts, 1 hour or until doubled in size.
Punch dough down. Divide in half.