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Goodwill and Other Identifiable Intangible Assets, Net (Goodwill Rollforward) (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Roll Forward]    
Beginning balance $ 154,535 [1] $ 131,995
Acquisitions 0 17,341
Foreign currency translation adjustment (957) (3)
Ending balance $ 153,578 $ 149,333
[1] Prior period information has been restated for the adoption of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” which we adopted on October 1, 2018.