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Credit Risk and Other Concentrations (Details) | 12 Months Ended
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Sep. 30, 2019 customer | Sep. 30, 2019 | Sep. 30, 2019 payment_processor | Sep. 30, 2019 reportable_unit | Sep. 30, 2018 payment_processor customer | Sep. 30, 2017 payment_processor customer
Concentration Risk [Line Items] |  |  |  |  |  |
Number of third party payment processors | payment_processor |  |  | 6 |  |  |
Concentration risk (percent) |  |  |  |  |  | 85.00%
Gross Revenue | Supplier Concentration Risk |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Number of third party payment processors |  |  | 3 | 3 | 3 | 3
Concentration risk (percent) |  | 10.00% |  |  | 10.00% | 10.00%
Gross Revenue | Customer Concentration Risk |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Number of customers | customer | 0 |  |  |  | 0 | 0
Concentration risk (percent) |  | 1.00% |  |  | 1.00% | 1.00%

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