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Subsequent Events (Details) $ in Millions, $ in Millions		1 Months Ended		3 Months Ended	12 Months Ended
Subsequent Events (Details) $ in Millions, $ in Millions	Sep. 30, 2018 USD ($)	Nov. 14, 2018 USD ($)	Oct. 31, 2018 AUD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2016 USD ($)
Subsequent Event [Line Items]
Potential exposure on balance sheet	$ 3.4
Cash Converters International Limited \| Subsequent event
Subsequent Event [Line Items]
Settlement awarded to other party			$ 16.4
Forecast \| Cash Converters International Limited
Subsequent Event [Line Items]
Estimated charge related to settlement				$ 3.0
United Kingdom \| Cash Converters International Limited
Subsequent Event [Line Items]
Impairment of investments					$ 11.7	$ 11.0
United Kingdom \| Cash Converters International Limited \| Subsequent event
Subsequent Event [Line Items]
Impairment of investments		$ 11.7