Segment Information (Revenue By Product Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Revenue	$ 1,255,242	$ 1,356,967	$ 1,293,541
CAD [Member]
Revenue	511,582	581,508	552,442
Extended PLM [Member]
Revenue	524,741	599,312	571,058
SLM [Member]
Revenue	166,060	170,980	170,041
IoT Segment [Member]
Revenue	$ 52,859	$ 5,167	$ 0