OK, so the array serves no purpose on the form page, since
you don't yet have any data. You need that on the action page.
Hopefully this will give you some pointers...
Form Page
<Cfoutput query="getReports">
<input type="text" name="data_#getReports.report_ID#">
<inputy type="hidden" name="report_ids"
value="#report_id#">
</cfoutput>
Action Page
<Cfloop list="#report_ids#" index="report_id">
<cfset thisReportData=form["data_"&report_id]>
<cfoutput><br>#report_id# =
#thisReportData#</cfoutput>
</cfloop>