Summary of Significant Accounting Policies (Property, Equipment and Improvements, Net) (Details) |
12 Months Ended |
---|---|
Sep. 30, 2021 | |
Furniture and fixtures, purchases software and other equipment | Minimum | |
Property, Plant and Equipment [Line Items] | |
Property, equipment and improvements depreciation life | 3 years |
Furniture and fixtures, purchases software and other equipment | Maximum | |
Property, Plant and Equipment [Line Items] | |
Property, equipment and improvements depreciation life | 10 years |
Building Improvements and buildings | Minimum | |
Property, Plant and Equipment [Line Items] | |
Property, equipment and improvements depreciation life | 10 years |
Building Improvements and buildings | Maximum | |
Property, Plant and Equipment [Line Items] | |
Property, equipment and improvements depreciation life | 39 years |