CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities
Net income	$ 93,923	$ 42,534
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	3,816	2,375
Equity-based awards	3,351	1,598
(Gain) loss on asset disposals	(196)	60
Change in fair value of long-term warrant liability	0	(771)
Non-cash interest expense	503	6,178
Deferred income tax provision	2,338	0
Payment of acquisition contingent consideration	(5,520)	0
(Increase) decrease in assets:
Accounts receivable	(19,031)	(42,145)
Inventories	47,146	106,038
Prepaid expenses and other current assets	(16,892)	(3,557)
Deposits	(152)	(11)
Increase (decrease) in liabilities:
Accounts payable	11,124	19,608
Other payables and accrued expenses	11,307	12,718
Customer deposits	21,478	7,971
Net cash provided by operating activities	153,195	152,596
Cash flows from investing activities
Purchases of property and equipment and construction in progress	(7,802)	(3,923)
Proceeds from disposal of property and equipment	168	1,616
Cash used in acquisitions	(83,486)	0
Net cash used in investing activities	(91,120)	(2,307)
Cash flows from financing activities
Net borrowings from floor plan	(27,455)	(49,316)
Proceeds from long-term debt	30,000	49,307
Payments on long-term debt	(7,237)	(19,380)
Payments of debt issuance costs	(701)	(1,762)
Payments of initial public offering costs	0	(5,217)
Payments of September offering costs	(540)	0
Payment of acquisition contingent consideration	0	(1,457)
Distributions to redeemable preferred interest members	0	(90,503)
Proceeds from issuance of Class A common stock sold in initial public offering, net of underwriting discounts and commissions	0	59,234
Payments of tax withholdings for equity-based awards	(449)	0
Distributions to members	(3,160)	(11,618)
Net cash used in financing activities	(9,542)	(70,712)
Net change in cash	52,533	79,577
Cash and restricted cash at beginning of period	68,153	11,492
Cash and restricted cash at end of period	120,686	91,069
Supplemental cash flow disclosures
Cash paid for interest	4,925	8,696
Cash paid for income taxes	13,993	0
Noncash items
Acquisition purchase price funded by seller notes payable	2,056	0
Acquisition purchase price funded by contingent consideration	5,482	0
Purchase of property and equipment funded by long-term debt	1,693	1,046
Dividends and distributions payable	27,789	0
Distributions to members payable	$ 610	$ 0