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Credit Risk and Other Concentrations (Details)	12 Months Ended
	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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Concentration Risk, Number of Customers

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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