Summary of Significant Accounting Policies - Equity Method Investments (Details) - Cash Converters International Limited $ in Millions	12 Months Ended
Sep. 30, 2017 USD ($)
Schedule of Equity Method Investments [Line Items]
Income from investment, period of lag	3 months
Negative basis in investment	$ 20.7

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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