Summary of Significant Accounting Policies (Property, Equipment and Improvements, Net) (Details)	12 Months Ended
	Sep. 30, 2020
Furniture and Fixtures | Minimum
Property, Plant and Equipment [Line Items]
Property, equipment and improvements depreciation life	3 years
Furniture and Fixtures | Maximum
Property, Plant and Equipment [Line Items]
Property, equipment and improvements depreciation life	10 years
Building Improvements | Minimum
Property, Plant and Equipment [Line Items]
Property, equipment and improvements depreciation life	10 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Property, equipment and improvements depreciation life	39 years