Supplemental Consolidated Financial Information - Supplemental of Consolidated Statements of Cash Flows Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Supplemental disclosure of cash flow information
Cash and cash equivalents at beginning of period	$ 170,513	$ 220,595
Restricted cash at beginning of period	9,294	8,373
Cash and cash equivalents and restricted cash at beginning of period	179,807	228,968
Cash and cash equivalents at end of period	505,239	229,111
Restricted cash at end of period	9,499	8,581
Cash and cash equivalents and restricted cash at end of period	514,738	237,692
Non-cash investing and financing activities:
Pawn loans forfeited and transferred to inventory	210,786	183,532
Accrued debt issuance costs	2,231	0
Accrued acquisition consideration	$ 0	$ 616