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Goodwill and other Identifiable Intangible Assets (Goodwill) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Goodwill [Roll Forward]    
Beginning balance $ 131,995 $ 109,448
Acquisitions 23,216 21,465
Foreign currency translation adjustment (676) 1,082
Ending balance $ 154,535 $ 131,995