Income Taxes - Summary of Major Tax Jurisdiction (Details)	12 Months Ended
	Sep. 30, 2025
United States
Income Tax Examination [Line Items]
Open Years	2022 2023 2024 2025
Germany
Income Tax Examination [Line Items]
Open Years	2019 2020 2021 2022 2023 2024 2025
France
Income Tax Examination [Line Items]
Open Years	2023 2024 2025
Japan
Income Tax Examination [Line Items]
Open Years	2020 2021 2022 2023 2024 2025
Ireland
Income Tax Examination [Line Items]
Open Years	2019 2020 2021 2022 2023 2024 2025