CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income	$ (6,176)	$ (39,111)	$ 152,611
Adjustments to reconcile net (loss) income to net cash provided by (used in) operating activities:
Depreciation and amortization	22,187	26,789	16,296
Equity-based compensation	8,443	8,962	10,013
Loss (gain) on asset disposals	36	221	(135)
Loss on disposal of a business	0	750	0
Restructuring and impairment	539	147,402	0
Loss on extinguishment of debt	0	0	356
Non-cash interest expense	2,099	10,129	3,250
Deferred income tax provision	(334)	(23,030)	5,741
Change in fair value of contingent consideration	1,763	(1,604)	10,380
Loss on equity investment	198	446	1,228
(Increase) decrease in assets:
Accounts receivable	(1,477)	(10,051)	(3,711)
Inventories	24,636	(232,285)	(167,183)
Prepaid expenses and other current assets	(17,939)	10,308	(34,357)
Other assets	4,574	(3,188)	(1,940)
Increase (decrease) in liabilities:
Accounts payable	233	197	6,424
Other payables and accrued expenses	(13,381)	(7,643)	4,140
Tax receivable agreement liability	(2,602)	(3,227)	(67)
Customer deposits	12,040	(14,825)	4,401
Net cash provided by (used in) operating activities	34,839	(129,760)	7,447
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment and construction in progress	(25,918)	(21,251)	(11,403)
Proceeds from disposal of property and equipment	757	567	345
Purchases of equity investments	0	0	(2,000)
Cash used for additions to intangible assets	(909)	(2,823)	(4,246)
Cash used in acquisitions, net of cash acquired	(5,712)	(28,882)	(459,540)
Proceeds from disposal of a business	45,100	788	0
Net cash provided by (used in) investing activities	13,318	(51,601)	(476,844)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net (payments) borrowings from floor plan	(45,638)	219,688	152,874
Proceeds from long-term debt	43,392	30,000	412,492
Payments on long-term debt	(78,381)	(18,338)	(88,033)
Payments of debt issuance costs	(2,221)	0	(9,095)
Payments of contingent consideration	(5,888)	(12,574)	(371)
Proceeds from issuance of Class A common stock as part of employee stock purchase plan	1,520	2,092	0
Payments of tax withholdings for equity-based awards	(2,641)	(1,971)	(1,628)
Distributions to members	(5,415)	(3,603)	(9,482)
Purchase of non-controlling interest	(18,840)	0	0
Repurchase and retirement of Class A common stock	0	(1,579)	(354)
Net cash (used in) provided by financing activities	(114,112)	213,715	456,403
Effects of exchange rate changes on cash and restricted cash	(18)	9	(8)
Net change in cash and restricted cash	(65,973)	32,363	(13,002)
Cash and restricted cash at beginning of period	93,310	60,947	73,949
Cash and restricted cash at end of period	27,337	93,310	60,947
Supplemental cash flow disclosures
Cash paid for interest	75,957	49,508	14,598
Cash paid for income taxes	5,495	23,322	35,229
Noncash items
Acquisition purchase price funded by seller notes payable	0	0	1,126
Acquisition purchase price funded by contingent consideration	0	2,550	15,321
Acquisition purchase price funded by issuance of Class A common stock	0	0	14,627
Purchase of property and equipment funded by long-term debt	156	1,122	2,087
Acquisition purchase price funded by affiliate financing	0	10,600	0
Settlement of affiliate financing with proceeds from sale and leaseback	$ 0	$ 10,600	$ 0