Create 2 calculated fields for start date and end date, Where the start date is September last year and end date is September current year.
DATEADD('month',-1,MAKEDATE(YEAR(TODAY())-1,MONTH(TODAY()),01 ) )
DATEADD('month',-1,MAKEDATE(YEAR(TODAY()),MONTH(TODAY()),01 ) )
Now one more calculated field which will create the filter and add the formula to filter to get the required data.
[Order Date]>=[Start Date] AND
[Order Date] <=[End Date]
Add to filter and then select True
Note: Here today function means the start of the fiscal year that you need to manage.