Debt - Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Recourse to EZCORP | 2019 Convertible Notes
Debt Instrument [Line Items]
Contractual interest expense	$ 1.1	$ 1.3	$ 3.2	$ 3.8
Amortization of debt discount and deferred financing costs	2.5	2.8	7.5	8.3
Total interest expense	3.6	4.1	10.7	12.1
Senior Notes | 2025 Convertible Notes
Debt Instrument [Line Items]
Contractual interest expense	0.5	0.0	0.5	0.0
Amortization of debt discount and deferred financing costs	0.8	0.0	0.8	0.0
Total interest expense	1.3	0.0	1.3	0.0
Line of Credit | 2024 Convertible Notes
Debt Instrument [Line Items]
Contractual interest expense	1.1	0.0	3.1	0.0
Amortization of debt discount and deferred financing costs	1.3	0.0	3.8	0.0
Total interest expense	$ 2.4	$ 0.0	$ 6.9	$ 0.0