Credit Risk and Other Concentrations (Details)	12 Months Ended
Sep. 30, 2020 payment_processor customer	Sep. 30, 2019 customer payment_processor	Sep. 30, 2018 payment_processor customer
Concentration Risk [Line Items]
Number of third party payment processors	6
Gross Revenue \| Customer Concentration Risk
Concentration Risk [Line Items]
Number of customers \| customer	0	0	0
Concentration risk (percent)	10.00%	10.00%	10.00%
Gross Revenue \| Supplier Concentration Risk
Concentration Risk [Line Items]
Number of third party payment processors	3	3	3
Concentration risk (percent)	10.00%	10.00%	10.00%

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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