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Income Taxes - Tax Jurisdictions and Years Currently under Audit Exam (Details)	9 Months Ended
	Jun. 30, 2019
UNITED STATES
Income Tax Examination [Line Items]
Tax years currently under audit exam	2015 2016
BELGIUM
Income Tax Examination [Line Items]
Tax years currently under audit exam	2015 2016 2017
CHINA
Income Tax Examination [Line Items]
Tax years currently under audit exam	2008 2009 2010 2011 2012 2013 2014 2015 2016
France
Income Tax Examination [Line Items]
Tax years currently under audit exam	2010 2011 2012 2015 2016
Germany
Income Tax Examination [Line Items]
Tax years currently under audit exam	2007 2008 2009 2010 2011 2012 2013 2014 2015 2016
JAPAN
Income Tax Examination [Line Items]
Tax years currently under audit exam	2015 2016 2017 2018
United Kingdom
Income Tax Examination [Line Items]
Tax years currently under audit exam	2012 2013 2014 2015

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Tax year being audited in the income tax examination, in CCYY format.

+ References

No definition available.

+ Details

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