CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 71,755	$ 130,323
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	19,126	10,816
Equity-based awards	7,185	7,274
Loss (gain) on asset disposals	282	(59)
Non-cash interest expense	9,432	1,370
Deferred income tax provision	2,826	2,030
Change in fair value of contingent consideration	763	11,022
Loss on equity investment	184	0
(Increase) decrease in assets:
Accounts receivable	(35,825)	(41,235)
Inventories	(193,722)	(88,158)
Prepaid expenses and other current assets	(12,958)	(17,770)
Other assets	(2,866)	(160)
Increase (decrease) in liabilities:
Accounts payable	12,372	33,624
Other payables and accrued expenses	(2,414)	8,096
Tax receivable agreement liability	0	313
Customer deposits	(10,337)	4,637
Net cash (used in) provided by operating activities	(134,197)	62,123
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment and construction in progress	(17,001)	(11,649)
Proceeds from disposal of property and equipment	326	122
Cash used for additions to intangible assets	(1,467)	0
Cash used in acquisitions, net of cash acquired	(28,611)	(326,089)
Net cash used in investing activities	(46,753)	(337,616)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net borrowings from floor plan	175,434	103,103
Proceeds from long-term debt	30,000	240,000
Payments on long-term debt	(17,756)	(18,090)
Payments of debt issuance costs	0	(4,057)
Payments of contingent consideration	(12,259)	(133)
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	(613)	(6,457)
Repurchase and retirement of Class A common stock	(1,579)	0
Net cash provided by financing activities	173,150	313,443
Effects of exchange rate changes on cash and restricted cash	15	0
Net change in cash	(7,785)	37,950
Cash and restricted cash at beginning of period	60,947	73,949
Cash and restricted cash at end of period	53,162	111,899
Supplemental cash flow disclosures:
Cash paid for interest	33,520	9,623
Cash paid for income taxes	21,949	6,344
Noncash items:
Acquisition purchase price funded by seller notes payable	0	1,126
Acquisition purchase price funded by contingent consideration	2,550	15,321
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	1,423
Right-of-use assets obtained in exchange for new operating lease liabilities	14,826	46,378
Acquisition purchase price funded by affiliate financing	10,600	0
Settlement of affiliate financing with proceeds from sale and leaseback	$ 10,600	$ 0