Supplemental Consolidated Financial Information - Supplemental of Consolidated Statements of Cash Flows Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Roll Forward]
Cash and cash equivalents at beginning of period	$ 220,595	$ 206,028
Restricted cash at beginning of period	8,373	8,341
Cash and cash equivalents and restricted cash at beginning of period	228,968	214,369
Cash and cash equivalents at end of period	229,111	243,128
Restricted cash at end of period	8,581	8,451
Cash and cash equivalents and restricted cash at end of period	237,692	251,579
Non-cash investing and financing activities:
Pawn loans forfeited and transferred to inventory	183,532	159,398
Transfer of equity consideration for acquisition	0	99
Acquisition earn-out contingency	0	2,000
Accrued acquisition consideration	$ 616	$ 1,145