Goodwill and other Identifiable Intangible Assets Goodwill (Details) (USD $)	9 Months Ended
	Jun. 30, 2012 methodologies acquisitions	Jun. 30, 2011
Goodwill [Roll Forward]
Beginning balance	$ 86,012,000	$ 86,210,000
Foreign currency translation adjustment	(468,000)	395,000
Ending balance	85,544,000	86,605,000
Goodwill [Line Items]
Number of different acquisitions	8
Period of acquisitions	12 years
Number of methodologies used in goodwill impairment testing	3
Control premium percent	40.00%
Previous control premium percent	35.00%
Market capitalization	264,300,000
Carrying value	$ 265,700,000
Percent fair value in excess of carrying value of goodwill	39.00%
Minimum [Member]
Goodwill [Line Items]
Control premium percent	30.00%
Maximum [Member]
Goodwill [Line Items]
Control premium percent	45.00%