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Income Taxes - Tax Jurisdictions and Years Currently under Audit Exam (Details) | 9 Months Ended
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Jun. 30, 2021
UNITED STATES | Earliest tax year under exam |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2017
UNITED STATES | Latest tax year under exam |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2018
BELGIUM | Earliest tax year under exam |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2015
BELGIUM | Latest tax year under exam |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2020
CHINA | Earliest tax year under exam |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2017
CHINA | Latest tax year under exam |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2019
Germany | Earliest tax year under exam |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2007
Germany | Latest tax year under exam |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2018
LUXEMBOURG | Earliest tax year under exam |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2017
LUXEMBOURG | Latest tax year under exam |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2018
MEXICO | Earliest tax year under exam |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2015
MEXICO | Latest tax year under exam |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2020
United Kingdom | Tax Year 2014 |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2014
United Kingdom | Tax Year 2015 [Member] |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2015
United Kingdom | Tax Year 2018 |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2018

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