Segment Information (Revenue By Geographic 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
Total long-lived intangible assets		67,113	65,162	67,783
Americas [Member]
Revenue	[1]	487,594	530,311	558,671
Total long-lived intangible assets	[2]	48,281	47,509	51,027
Europe [Member]
Revenue	[3]	424,268	467,805	528,090
Total long-lived intangible assets		6,915	7,424	7,020
Pacific Rim [Member]
Revenue		123,766	139,165	148,151
Japan [Member]
Revenue		104,905	117,961	122,055
Asia Pacific [Member]
Total long-lived intangible assets		11,917	10,229	9,736
United States [Member]
Revenue		463,100	500,600	518,700
Germany [Member]
Revenue		$ 167,200	$ 177,100	$ 200,300

[1] Includes revenue in the United States totaling $463.1 million, $500.6 million and $518.7 million for 2016, 2015 and 2014, respectively.

[2] Substantially all of the Americas long-lived tangible assets are located in the United States.

[3] Includes revenue in Germany totaling $167.2 million, $177.1 million and $200.3 million for 2016, 2015 and 2014, respectively.