Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Foreign currency losses (gains) on intracompany loans	$ (927)	$ (8,216)	$ 12,599
Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	1 year
Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	26 years
Machinery and equipment | Minimum
Finite-Lived Intangible Assets [Line Items]
Property, plant and equipment, useful life	3 years
Machinery and equipment | Maximum
Finite-Lived Intangible Assets [Line Items]
Property, plant and equipment, useful life	20 years
Building and Building Improvements | Minimum
Finite-Lived Intangible Assets [Line Items]
Property, plant and equipment, useful life	10 years
Building and Building Improvements | Maximum
Finite-Lived Intangible Assets [Line Items]
Property, plant and equipment, useful life	40 years