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Income Taxes (Summary of Income Tax Examinations) (Details)
12 Months Ended
Sep. 30, 2017
Domestic | United States | Minimum  
Income Tax Examination [Line Items]  
Open tax year subject to examination 2011
Domestic | United States | Maximum  
Income Tax Examination [Line Items]  
Open tax year subject to examination 2017
Foreign | Canada | Minimum  
Income Tax Examination [Line Items]  
Open tax year subject to examination 2013
Foreign | Canada | Maximum  
Income Tax Examination [Line Items]  
Open tax year subject to examination 2017
Foreign | France | Minimum  
Income Tax Examination [Line Items]  
Open tax year subject to examination 2014
Foreign | France | Maximum  
Income Tax Examination [Line Items]  
Open tax year subject to examination 2017
Foreign | Germany | Minimum  
Income Tax Examination [Line Items]  
Open tax year subject to examination 2012
Foreign | Germany | Maximum  
Income Tax Examination [Line Items]  
Open tax year subject to examination 2017
Foreign | Netherlands | Minimum  
Income Tax Examination [Line Items]  
Open tax year subject to examination 2012
Foreign | Netherlands | Maximum  
Income Tax Examination [Line Items]  
Open tax year subject to examination 2017
Foreign | Spain | Minimum  
Income Tax Examination [Line Items]  
Open tax year subject to examination 2011
Foreign | Spain | Maximum  
Income Tax Examination [Line Items]  
Open tax year subject to examination 2017
Foreign | United Kingdom | Minimum  
Income Tax Examination [Line Items]  
Open tax year subject to examination 2014
Foreign | United Kingdom | Maximum  
Income Tax Examination [Line Items]  
Open tax year subject to examination 2017
Foreign | China | Minimum  
Income Tax Examination [Line Items]  
Open tax year subject to examination 2012
Foreign | China | Maximum  
Income Tax Examination [Line Items]  
Open tax year subject to examination 2017
Foreign | South Korea | Minimum  
Income Tax Examination [Line Items]  
Open tax year subject to examination 2010
Foreign | South Korea | Maximum  
Income Tax Examination [Line Items]  
Open tax year subject to examination 2017
Foreign | Taiwan | Minimum  
Income Tax Examination [Line Items]  
Open tax year subject to examination 2012
Foreign | Taiwan | Maximum  
Income Tax Examination [Line Items]  
Open tax year subject to examination 2017
Foreign | Chile | Minimum  
Income Tax Examination [Line Items]  
Open tax year subject to examination 2013
Foreign | Chile | Maximum  
Income Tax Examination [Line Items]  
Open tax year subject to examination 2017