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Significant Accounting Policies - Property and Equipment (Details)
12 Months Ended
Sep. 30, 2020
Minimum | Building and land  
Property, Plant and Equipment  
Estimated useful live (in years) 10 years
Minimum | Furniture and fixtures  
Property, Plant and Equipment  
Estimated useful live (in years) 3 years
Minimum | Computer systems and equipment  
Property, Plant and Equipment  
Estimated useful live (in years) 3 years
Maximum | Building and land  
Property, Plant and Equipment  
Estimated useful live (in years) 45 years
Maximum | Furniture and fixtures  
Property, Plant and Equipment  
Estimated useful live (in years) 10 years
Maximum | Computer systems and equipment  
Property, Plant and Equipment  
Estimated useful live (in years) 12 years