CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 38,465	$ 65,840
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	12,542	6,541
Equity-based awards	5,063	4,813
Loss (gain) on asset disposals	210	(14)
Non-cash interest expense	3,077	626
Deferred income tax provision	1,453	3,463
Change in fair value of contingent consideration	327	7,904
Loss on equity investment	280	0
(Increase) decrease in assets:
Accounts receivable	(22,893)	(44,119)
Inventories	(214,150)	(113,879)
Prepaid expenses and other current assets	11,181	(14,189)
Other assets	(1,812)	(50)
Increase (decrease) in liabilities:
Accounts payable	5,726	26,363
Other payables and accrued expenses	(1,288)	4,810
Tax receivable agreement liability	0	313
Customer deposits	(7,440)	8,156
Net cash used in operating activities	(169,259)	(43,422)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment and construction in progress	(12,029)	(7,993)
Proceeds from disposal of property and equipment	287	22
Cash used for additions to intangible assets	(26)	0
Cash used in acquisitions, net of cash acquired	(28,611)	(288,894)
Net cash used in investing activities	(40,379)	(296,865)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net borrowings from floor plan	216,063	140,619
Proceeds from long-term debt	30,000	240,000
Payments on long-term debt	(11,874)	(13,842)
Payments of debt issuance costs	0	(4,053)
Payments of contingent consideration	(11,787)	(53)
Payments of tax withholdings for equity-based awards	(1,140)	(923)
Proceeds from issuance of Class A common stock as part of employee stock purchase plan	1,063	0
Distributions to members	(391)	(6,453)
Repurchase and retirement of Class A common stock	(1,579)	0
Net cash provided by financing activities	220,355	355,295
Effects of exchange rate changes on cash and restricted cash	19	0
Net change in cash	10,736	15,008
Cash and restricted cash at beginning of period	60,947	73,949
Cash and restricted cash at end of period	71,683	88,957
Supplemental cash flow disclosures:
Cash paid for interest	23,362	5,925
Cash paid for income taxes	13,388	6,310
Noncash items:
Acquisition purchase price funded by seller notes payable	0	1,126
Acquisition purchase price funded by contingent consideration	2,550	15,321
Accrued purchase consideration	0	0
Acquisition purchase price funded by issuance of Class A common stock	0	6,834
Purchase of property and equipment funded by long-term debt	1,053	529
Right-of-use assets obtained in exchange for new operating lease liabilities	7,978	36,174
Acquisition purchase price funded by affiliate financing	10,600	0
Settlement of affiliate financing with proceeds from sale and leaseback	$ 10,600	$ 0