CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities
Net income	$ 130,323	$ 93,923
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	10,816	3,816
Equity-based awards	7,274	3,351
Gain on asset disposals	(59)	(196)
Non-cash interest expense	1,370	503
Deferred income tax provision	2,030	2,338
Loss on change in fair value of contingent consideration	11,022	0
(Increase) decrease in assets:
Accounts receivable	(41,235)	(19,031)
Inventories	(88,158)	47,146
Prepaid expenses and other assets	(17,770)	(16,767)
Deposits	(160)	(152)
Increase (decrease) in liabilities:
Accounts payable	33,624	11,124
Other payables and accrued expenses	8,096	5,662
Tax receivable agreement liability	313	0
Customer deposits	4,637	21,478
Net cash provided by operating activities	62,123	153,195
Cash flows from investing activities
Purchases of property and equipment and construction in progress	(11,649)	(7,802)
Proceeds from disposal of property and equipment	122	168
Cash used in acquisitions	(326,089)	(83,486)
Net cash used in investing activities	(337,616)	(91,120)
Cash flows from financing activities
Net borrowings from floor plan	103,103	(27,455)
Proceeds from long-term debt	240,000	30,000
Payments of long-term debt	(18,090)	(7,237)
Payments of debt issuance costs	(4,057)	(701)
Payments of September 2020 offering costs	0	(540)
Payments of contingent consideration	(133)	0
Payments of tax withholdings for equity-based awards	(923)	(449)
Distributions to members	(6,457)	(3,160)
Net cash provided by (used in) financing activities	313,443	(9,542)
Net change in cash	37,950	52,533
Cash and restricted cash at beginning of period	73,949	68,153
Cash and restricted cash at end of period	111,899	120,686
Supplemental cash flow disclosures
Cash paid for interest	9,623	4,925
Cash paid for income taxes	6,344	13,993
Noncash items
Acquisition purchase price funded by seller notes payable	1,126	2,056
Acquisition purchase price funded by contingent consideration	15,321	5,482
Acquisition purchase price funded by issuance of Class A common stock	6,834	0
Purchase of property and equipment funded by long-term debt	1,423	1,693
Initial operating lease right-of-use assets for adoption of Topic 842	0	71,835
Right-of-use assets obtained in exchange for new operating lease liabilities	46,378	17,224
Dividends and distributions payable	0	27,789
Distributions to members payable	$ 0	$ 610