Withdrawal from the university (all classes) during any semester, whether official or unofficial, may require the return of federal and state financial aid and state financial aid, and the reduction or loss of some institutional aid. 

A calculation will be performed to determine the amount, if any, of the Title IV aid (Pell Grant, FSEOG, Direct Loans, Perkins Loans, PLUS Loans) earned by the student for the days in which he/she attended, up to the date of withdrawal. The student is responsible for any balance owed to the university.

In order to complete an official withdrawal, a student needs to complete a Petition to Withdraw available in Enrollment Services. Ceasing to attend class without proper notification to the university will result in an unofficial withdrawal. A calculation will still be performed to determine aid earned and some aid may be returned.

More details can be found here.