You can create a line item in the module that does not have time as a dimension and use a formula to reference the total value. If you have the 'All Periods' time then you can write a select statement to reference it, or if you utilize the current period feature, then you could write the select statement using current period. This second option would require other line items to ensure that the current period has the total value. In the screenshot, I used a line to cumulate all the values and then a line to grab the yearvalue. Both of these options allow for a sustainable model where you would not have to update the formula year over year.
If neither 'All Periods' or 'Current Period' are an option, then you could reference the specific full year value in the select statement using Time.'FY17' but this would have to be adjusted each year.
One thing to note is that I had to pivot so line items were in columns in order to get the import into the list to work.