Income Taxes (Earings Before Income Taxes by Geographical Area) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Income Taxes
United States									$ 175,146	$ 172,315	$ 148,837
Other countries									51,340	68,634	78,407
Consolidated earnings before income taxes	$ 80,756	$ 63,408	$ 54,366	$ 27,956	$ 68,727	$ 57,559	$ 57,591	$ 57,072	$ 226,486	$ 240,949	$ 227,244