Right from the Disney website for packages:
For a cancellation made 44 to 6 days prior to arrival, there is a cancellation fee of $100 per package plus any cancellation fees assessed by hotels or other suppliers.
For a cancellation made 5 days or less prior to arrival, there is a cancellation fee of $200 per package plus any cancellation fees by hotels or other suppliers. No refunds will be given to no-shows. For a change made 44 days or less prior to arrival or that results in a rate change, there is a change fee of $50 per package plus any change fees assessed by hotels or other suppliers. For changes, the change fees must be paid in addition to any increase in rate resulting from the change.
Hope this helps!