If Grade Access is correctly set, but a course is still not showing Grade Detail for a course,  this could be caused by the following:

1. If there are assignments but no grades, "Grade Detail" does not appear.

Other things to note regarding the appearance of Grade Detail:
1. If the teacher has not yet placed anything into the grade book, the "Grade Detail" appears but is completely empty.
2. If there are grades, the "Grade Detail" appears with the graded assignments.