Income Taxes (Summary of Income Tax Examinations) (Details)	12 Months Ended
	Sep. 30, 2018
Domestic | United States | Minimum
Income Tax Examination [Line Items]
Open tax year subject to examination	2015
Domestic | United States | Maximum
Income Tax Examination [Line Items]
Open tax year subject to examination	2018
State | United States - All States | Minimum
Income Tax Examination [Line Items]
Open tax year subject to examination	2011
State | United States - All States | Maximum
Income Tax Examination [Line Items]
Open tax year subject to examination	2018
Foreign | Canada | Minimum
Income Tax Examination [Line Items]
Open tax year subject to examination	2014
Foreign | Canada | Maximum
Income Tax Examination [Line Items]
Open tax year subject to examination	2018
Foreign | France | Minimum
Income Tax Examination [Line Items]
Open tax year subject to examination	2015
Foreign | France | Maximum
Income Tax Examination [Line Items]
Open tax year subject to examination	2018
Foreign | Germany | Minimum
Income Tax Examination [Line Items]
Open tax year subject to examination	2013
Foreign | Germany | Maximum
Income Tax Examination [Line Items]
Open tax year subject to examination	2018
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	2018
Foreign | Spain | Minimum
Income Tax Examination [Line Items]
Open tax year subject to examination	2015
Foreign | Spain | Maximum
Income Tax Examination [Line Items]
Open tax year subject to examination	2018
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	2018
Foreign | China | Minimum
Income Tax Examination [Line Items]
Open tax year subject to examination	2013
Foreign | China | Maximum
Income Tax Examination [Line Items]
Open tax year subject to examination	2018
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	2018
Foreign | Taiwan | Minimum
Income Tax Examination [Line Items]
Open tax year subject to examination	2013
Foreign | Taiwan | Maximum
Income Tax Examination [Line Items]
Open tax year subject to examination	2018
Foreign | Chile | Minimum
Income Tax Examination [Line Items]
Open tax year subject to examination	2015
Foreign | Chile | Maximum
Income Tax Examination [Line Items]
Open tax year subject to examination	2018