If you set your Fiscal year to start in August, then reports will total by quarters starting in August.
To do this, go to Company | My Company. Then click the Edit link in the upper right corner (looks like a fork) and then on the Report Information tab, pick August for the Fiscal Year.
Then run a P&L and at the top of the report pick This Fiscal year as the date range, and then Quarter for the Show Columns value.