Unfortunately, SSRS does not have a double-dashed option, but you can use conditional formatting on the textbox to control the border.
With your data:
I have a simple table:
For the detail row, I have set the Top and Bottom border style to be expression-based, based on the value of Name
:
Top:
=IIf(Fields!Name.Value = "TOTAL", "Dashed", "None")
Bottom:
=IIf(Fields!Name.Value = "TOTAL", "Double", "None")
This gives (very close to) the desired result:
However, be aware that you might run into a few issues, as identified in this MSDN thread:
Double Line border turn to be single in Reporting Service
I had to make sure the Bottom border was 3pt in width and that there was a table footer row to get it to look correct in Preview. Excel works fine whatever.