Fair Value Measurements - Additional Information (Details) $ in Millions	6 Months Ended
	Mar. 31, 2020 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Ownership percentage	0.13
Restructured notes receivable, amount paid by AlphaCredit	$ 4.0
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Grupo Finmart | Notes Receivable | Discount Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input of note receivable	0.07