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Summary of Significant Accounting Policies - Foreign Currency and Advertising (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Schedule of Equity Method Investments [Line Items]      
Foreign currency transaction gains (losses) not accounted for as translations $ (0.4) $ (0.5) $ 1.1
Advertising expense $ 2.5 $ 1.9 $ 2.1
Cash Converters International Limited      
Schedule of Equity Method Investments [Line Items]      
Period related interest in investee's net income is translated 6 months