Segment Information (Revenue By Geographic Segment) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2010
Revenue	$ 1,255,679		$ 1,166,949		$ 1,010,049
Total long-lived intangible assets	63,466		62,569		58,064
Americas [Member]
Revenue	479,932	[1]	429,215	[1]	385,853	[1]
Total long-lived intangible assets	46,083	[2]	42,767	[2]	38,417	[2]
Europe [Member]
Revenue	480,287	[3]	466,532	[3]	388,513	[3]
Total long-lived intangible assets	5,379		5,693		5,753
Pacific Rim [Member]
Revenue	160,834		148,000		131,632
Japan [Member]
Revenue	134,626		123,202		104,051
Asia Pacific Member
Total long-lived intangible assets	12,004		14,109		13,894
United States [Member]
Revenue	453,200		408,000		370,800
Germany [Member]
Revenue	$ 188,300		$ 173,300		$ 143,800

[1] Includes revenue in the United States totaling $453.2 million, $408.0 million and $370.8 million for 2012, 2011 and 2010, respectively.

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

[3] Includes revenue in Germany totaling $188.3 million, $173.3 million and $143.8 million for 2012, 2011 and 2010, respectively.