CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities
Net income	$ 152,611	$ 116,413	$ 48,508
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	16,296	5,411	3,249
Equity-based compensation	10,013	5,741	2,213
(Gain) loss on asset disposals	(135)	(94)	10
Change in fair value of warrant liability	0	0	(771)
Loss on extinguishment of debt	356	0	6,559
Non-cash interest expense, net	3,250	659	477
Deferred income tax provision	5,741	3,728	509
Change in fair value of contingent consideration	10,380	2,872	5,520
Loss on equity investments	1,228	0	0
(Increase) decrease in assets:
Accounts receivable	(3,711)	(9,531)	(3,185)
Inventories	(167,183)	25,289	127,214
Prepaid expenses and other assets	(34,357)	(18,924)	(7,984)
Other assets	(1,940)	(173)	(5)
Increase (decrease) in liabilities:
Accounts payable	6,424	(26)	7,235
Other payables and accrued expenses	4,140	4,010	10,528
Tax receivable agreement liability	(67)	0	0
Customer deposits	4,401	24,048	12,400
Net cash provided by operating activities	7,447	159,423	212,477
Cash flows from investing activities
Purchases of property and equipment	(11,403)	(9,896)	(6,309)
Proceeds from disposal of property and equipment	345	233	1,637
Purchases of equity investments	(2,000)	0	0
Cash used for additions to intangible assets	(4,246)	0	0
Cash used in acquisitions	(459,540)	(107,467)	0
Net cash used in investing activities	(476,844)	(117,130)	(4,672)
Cash flows from financing activities
Net borrowings (payments) from floor plan	152,874	(23,497)	(101,342)
Proceeds from long-term debt	412,492	30,000	129,306
Payments on long-term debt	(88,033)	(8,878)	(121,800)
Payments of debt issuance costs	(9,095)	(701)	(3,910)
Payments of debt extinguishment costs	0	0	(4,207)
Payments of initial public offering costs	0	0	(5,646)
Payments of September Offering costs	0	(540)	0
Payments of contingent consideration	(371)	0	(1,456)
Distributions to redeemable preferred interest members	0	0	(90,503)
Proceeds from issuance of Class A common stock sold in initial public offering, net of underwriting discounts and commissions	0	0	59,234
Proceeds from issuance of Class A common stock sold in September Offering, net of underwriting discounts and commissions	0	0	8,075
Payments of tax withholdings for equity-based awards	(1,628)	(802)	0
Dividends and distributions	0	(27,070)	0
Distributions to members	(9,482)	(5,009)	(18,895)
Repurchase and retirement of Class A common stock	(354)	0	0
Net cash provided by (used in) financing activities	456,403	(36,497)	(151,144)
Effect of exchange rate changes on cash and restricted cash	(8)	0	0
Net change in cash	(13,002)	5,796	56,661
Cash and restricted cash at beginning of period	73,949	68,153	11,492
Cash and restricted cash at end of period	60,947	73,949	68,153
Supplemental cash flow disclosures
Cash paid for interest	14,598	6,251	17,212
Cash paid for income taxes	35,229	28,537	246
Noncash items
Acquisition purchase price funded by seller notes payable	1,126	2,056	0
Acquisition purchase price funded by contingent consideration	15,321	9,200	0
Acquisition purchase price funded by issuance of Class A common stock	14,627	1,495	0
Accrued purchase consideration	0	1,889	0
Purchase of property and equipment funded by long-term debt	2,087	1,820	1,190
Dividends payable	0	1,035	0
Distributions payable	0	4,964	0
Offering costs, accrued not yet paid	0	0	430
Initial operating lease right-of-use-assets for adoption of Topic 842	$ 0	$ 71,823	$ 0