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Income Taxes Tax Jurisdictions and Years Currently under Audit Exam (Details)
12 Months Ended
Sep. 30, 2019
Belgium  
Income Tax Examination [Line Items]  
Tax jurisdictions and years currently under audit exam 2015 2016 2017
China  
Income Tax Examination [Line Items]  
Tax jurisdictions and years currently under audit exam 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018
Germany  
Income Tax Examination [Line Items]  
Tax jurisdictions and years currently under audit exam 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016
Japan  
Income Tax Examination [Line Items]  
Tax jurisdictions and years currently under audit exam 2015 2016 2017 2018
Spain  
Income Tax Examination [Line Items]  
Tax jurisdictions and years currently under audit exam 2015
United Kingdom  
Income Tax Examination [Line Items]  
Tax jurisdictions and years currently under audit exam 2012 2013 2014 2015