CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities
Net income (loss)	$ 11,775	$ (1,067)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	963	760
Equity-based awards	1,078	39
Gain on asset disposals	(102)	(143)
Change in fair value of long-term warrant liability	0	(771)
Non-cash interest expense	191	1,721
Deferred income tax provision	(94)	0
Payment of acquisition contingent consideration	(5,520)	0
(Increase) decrease in assets:
Accounts receivable	4,089	5,720
Inventories	(40,576)	(36,499)
Prepaid expenses and other current assets	2,013	70
Deposits	(42)	0
Increase (decrease) in liabilities:
Accounts payable	(2,799)	64
Other payables and accrued expenses	(4,362)	(1,472)
Customer deposits	4,771	2,855
Net cash used in operating activities	(28,615)	(28,723)
Cash flows from investing activities
Purchases of property and equipment and construction in progress	(2,423)	(1,997)
Proceeds from disposal of property and equipment	91	235
Cash used in acquisitions	(77,631)	0
Net cash used in investing activities	(79,963)	(1,762)
Cash flows from financing activities
Net borrowings from floor plan	42,269	39,105
Proceeds from long-term debt	30,000	0
Payments on long-term debt	(211)	(2,504)
Payments of debt issuance costs	(252)	(79)
Payments of initial public offering costs	0	(3,547)
Payments of september offering costs	(540)	0
Payment of acquisition contingent consideration	0	(1,040)
Distributions to redeemable preferred interest members	0	(1,310)
Distributions to members	(905)	(921)
Net cash provided by financing activities	70,361	29,704
Net change in cash	(38,217)	(781)
Cash and restricted cash at beginning of period	68,153	11,492
Cash and restricted cash at end of period	29,936	10,711
Supplemental cash flow disclosures
Cash paid for interest	1,653	2,791
Cash paid for income taxes	6,613	0
Noncash items
Acquisition purchase price funded by seller notes payable	2,056	0
Acquisition purchase price funded by contingent consideration	4,766	0
Accrued purchase consideration	3,719	0
Purchase of property and equipment funded by long-term debt	833	419
Distributions, declared not yet paid	$ 414	$ 0