Summary of Significant Accounting Policies - Property, Plant and Equipment (Details)	12 Months Ended
	Sep. 30, 2018
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Useful life of property plant and equipment	10 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Useful life of property plant and equipment	40 years
Computer equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life of property plant and equipment	3 years
Computer equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life of property plant and equipment	7 years
Software | Minimum
Property, Plant and Equipment [Line Items]
Useful life of property plant and equipment	3 years
Software | Maximum
Property, Plant and Equipment [Line Items]
Useful life of property plant and equipment	7 years
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life of property plant and equipment	2 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life of property plant and equipment	10 years
Furniture and fixtures | Minimum
Property, Plant and Equipment [Line Items]
Useful life of property plant and equipment	3 years
Furniture and fixtures | Maximum
Property, Plant and Equipment [Line Items]
Useful life of property plant and equipment	10 years