Basis of Presentation and Summary of Significant Accounting Policies - Property Plant and Equipment (Details)	12 Months Ended
	Sep. 30, 2021
Buildings | Minimum
Summary of Significant Accounting Policies [Line Items]
Estimated useful life	25 years
Buildings | Maximum
Summary of Significant Accounting Policies [Line Items]
Estimated useful life	30 years
Information systems
Summary of Significant Accounting Policies [Line Items]
Estimated useful life	5 years
Furniture, fixtures, computer and office equipment | Minimum
Summary of Significant Accounting Policies [Line Items]
Estimated useful life	3 years
Furniture, fixtures, computer and office equipment | Maximum
Summary of Significant Accounting Policies [Line Items]
Estimated useful life	7 years