Segment Information (Revenue By Product Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Revenue	$ 1,140,533	$ 1,255,242	$ 1,356,967
CAD [Member]
Revenue	462,307	511,582	581,508
Extended PLM [Member]
Revenue	456,285	524,741	599,312
SLM [Member]
Revenue	141,644	166,060	170,980
IoT Segment [Member]
Revenue	$ 80,297	$ 52,859	$ 5,167