That is a good suggestion. I was thinking about going that route if there was not a better solution. My real dataset has about 15 measures, so that would add quite a few extra columns for the user to sort through. Thank you John.
It looks like there are a few options here to work-around the formatting of the data when exporting to a crosstab.
1. As John suggested, add "export formatted" measures to the detail shelf. They will then be included in the export but will be hidden from the worksheet view.
2. Append ".csv" to the URL of the Tableau worksheet. This will automatically download a .csv file from the Tableau server for the worksheet. The decimals are included but the layout of the crosstab may differ from the worksheet view.
3. Add a duplicate worksheet that is formatted for export. You could even add an action from the original to the export worksheet.