Strategic Investments - Additional Information (Details) $ in Thousands			12 Months Ended
	Oct. 01, 2021 shares	Apr. 14, 2021 shares	Sep. 30, 2021 USD ($) shares	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments			$ 3,803	$ (2,429)	$ (135)
Cash Converters International Limited
Schedule of Equity Method Investments [Line Items]
Number of common shares owned (in shares) | shares			223,702,991
Percentage of common shares owned		35.65%	35.65%
Percentage of ownership increase			30.00%
Number of additional shares acquired (in shares) | shares		9,519,277
Income (loss) from equity method investments			$ 4,300	$ (2,100)	(100)
Accumulated undistributed after-tax earnings included in consolidated retained earnings			$ 18,000
Other than temporary impairment, before taxes					19,800
Other than temporary impairment, net of taxes					15,300
Impairment of investment, not other-than-temporary					$ 6,200
Cash Converters International Limited | Subsequent event
Schedule of Equity Method Investments [Line Items]
Number of common shares owned (in shares) | shares	236,702,991
Percentage of common shares owned	37.72%
Number of additional shares acquired (in shares) | shares	13,000,000
Rich Data Corporation
Schedule of Equity Method Investments [Line Items]
Ownership percentage after dilution			0.1314	0.1314	0.1314
Loss on deconsolidation			$ 400	$ 300	$ 200