Strategic Investments - Additional Information (Details) $ in Thousands, $ in Millions	1 Months Ended		3 Months Ended			12 Months Ended			104 Months Ended
	Jun. 30, 2018 USD ($) shares	Jun. 30, 2018 AUD ($) shares	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) shares	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investment						$ 0	$ 14,036	$ 0
Income (loss) from equity method investments						$ (135)	5,529	4,916
Cash Converters International Limited
Schedule of Equity Method Investments [Line Items]
Number of common shares owned | shares						214,183,714
Percentage of common shares owned						34.75%
Payments to acquire equity method investment									$ 96,100
Number of shares acquired (shares) | shares	57,631,230	57,631,230
Value of shares acquired	$ 14,000	$ 39.5
Percentage of ownership increase	3.00%	3.00%
Income (loss) from equity method investments						$ 100	$ 5,500	4,900
Dividends received								$ 1,200
Accumulated undistributed after-tax earnings included in consolidated retained earnings						15,900
Other than temporary impairment, before taxes			$ 6,500	$ 13,300
Other than temporary impairment, net of taxes			$ 5,000	$ 10,300
Impairment of investment, not other-than-temporary						$ 6,200
United Kingdom | Cash Converters International Limited
Schedule of Equity Method Investments [Line Items]
Impairment of investments					$ 11,700
Impairment of investments, net of tax					$ 9,200
Underwritten Placement | Cash Converters International Limited
Schedule of Equity Method Investments [Line Items]
Number of shares acquired (shares) | shares	123,300,000	123,300,000