Summary of Significant Accounting Policies - Property, Plant and Equipment (Details)	12 Months Ended
	Sep. 30, 2021
Land improvements | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	10 years
Land improvements | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	20 years
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	15 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	30 years
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	20 years
Furniture and fixtures | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years
Furniture and fixtures | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	10 years
Vehicles | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years
Vehicles | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	8 years
Information systems | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Information systems | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years