Income Taxes - Summary of Major Tax Jurisdiction (Details)	12 Months Ended
	Sep. 30, 2020
United States
Income Tax Examination [Line Items]
Open Years	2016 2017 2018 2019 2020
Germany
Income Tax Examination [Line Items]
Open Years	2015 2016 2017 2018 2019 2020
France
Income Tax Examination [Line Items]
Open Years	2017 2018 2019 2020
Japan
Income Tax Examination [Line Items]
Open Years	2015 2016 2017 2018 2019 2020
Ireland
Income Tax Examination [Line Items]
Open Years	2016 2017 2018 2019 2020