Supplemental Consolidated Financial Information - Schedule of Supplemental of Consolidated Statements of Cash Flows Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Supplemental disclosure of cash flow information
Cash and cash equivalents	$ 469,524	$ 170,513	$ 220,595
Short-term restricted cash	525	9,294	8,373
Long-term restricted cash	14,664	0	0
Total cash and cash equivalents and restricted cash	484,713	179,807	228,968	$ 214,369
Cash paid during the period for interest	11,080	12,069	11,143
Cash paid during the period for income taxes, net	39,456	25,739	11,415
Non-cash investing and financing activities:
Pawn loans forfeited and transferred to inventory	425,788	383,374	330,947
Transfer of equity consideration for acquisition	0	0	99
Acquisition earn-out contingency	0	0	2,000
Accrued acquisition consideration	5,950	791	1,412
Convertible notes share settlement	$ 96,902	$ 799	$ 0