As shown on this screen, SPID 122 was an idle blocker:
For the SPID being blocked, there is a value in the SQL column. Of course, there is not one for SPID 122 because by definition, there is no active SQL for it. However, it would be very useful to have a link with text similar to "Most recent SQL for this session" that would display the SQL executed by this SPID immediately prior to it becoming idle. If the SPID started to be an idle blocker during a previous time range, either display the SQL anyway or display a dialog stating that no SQL was found for the SPID in the currently selected time range and suggesting that a previous time range be selected.
