Supplemental Consolidated Financial Information (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 143,141	$ 157,567	$ 297,031
Restricted cash	0	4,875	255
Cash and cash equivalents and restricted cash	143,141	162,442	297,286	$ 285,578
Gross pawn service charges receivable	40,887	41,838	40,016
Allowance for uncollectible pawn service charges receivable	(8,637)	(10,036)	(8,458)
Pawn service charges receivable, net	32,250	31,802	31,558
Gross inventory	197,519	189,092	185,706
Inventory reserves	(10,150)	(9,737)	(10,284)
Inventory, net	187,369	179,355	175,422
Prepaid expenses and other	12,463	4,784	11,720
Accounts receivable and other	12,257	10,889	14,126
Income taxes receivable	11,422	10,248	5,361
2019 Convertible Notes Hedges	0	0	21
Prepaid expenses and other current assets	36,142	30,796	31,483
Property and equipment, gross	270,335	265,922	253,336
Accumulated depreciation	(205,089)	(198,565)	(183,566)
Total	65,246	67,357	69,770
Accounts payable	12,534	25,946	15,141
Accrued expenses and other	39,087	52,011	42,239
Accounts payable, accrued expenses and other current liabilities	$ 51,621	$ 77,957	$ 57,380