IDT training is the 5th of 6 courses that makes up the Budget Training Bundle. This course is offered by the UNT System Controller's Office. In this hands-on training, users will walk through the specific elements of the IDT forms and learn how to complete them. What's an IDT? An Interdepartmental Transaction (IDT) is a form which permits departments to reclassify revenues or expenses from one cost center to another.  The purpose of the transaction can be to purchase goods or services, to reclass expenditures, and/or reallocate revenues to different chartstrings.