The following are the ingredients that are used in my recipe for 1 batch (3 loaves) of homemade sourdough bread:

6 cups bread flour
1/3 cup sugar
1 ½ cups warm starter
1 cup warm water
1/2 cup vegetable oil
1 tablespoon salt
1 envelope regular yeast

Today, I purchased a 1lb. block of Fleishman's Instant Dry Yeast. I need to know how much of the IDY to use that would be the equivalent of the single envelope of regular yeast. Also, is IDY the same thing as the rapid rise? If so, after the bread dough is blended, do I go ahead and divide it into 3 loaf pans for only one rising? Please respond to eval(unescape('%64%6f%63%75%6d%65%6e%74%2e%77%72%69%74%65%28%27%3c%61%20%68%72%65%66%3d%22%6d%61%69%6c%74%6f%3a%6c%62%77%36%34%38%40%68%6f%74%6d%61%69%6c%2e%63%6f%6d%22%3e%6c%62%77%36%34%38%40%68%6f%74%6d%61%69%6c%2e%63%6f%6d%3c%2f%61%3e%27%29%3b')). THANK YOU !!!!!!!!!!