CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues
Total revenues	$ 404,207	$ 408,273	$ 947,901	$ 751,934
Cost of sales (exclusive of depreciation and amortization shown separately below)
Total cost of sales	277,255	313,588	679,727	580,476
Selling, general and administrative expenses	60,476	43,134	143,685	103,822
Depreciation and amortization	1,475	824	3,816	2,375
Transaction costs	65	31	633	3,393
Loss on contingent consideration	0	0	377	0
Income from operations	64,936	50,696	119,663	61,868
Other expense (income)
Interest expense - floor plan	956	2,298	2,206	7,482
Interest expense - other	1,083	3,082	3,222	7,392
Change in fair value of warrant liability	0	0	0	(771)
Other (income) expense, net	(158)	(43)	(247)	22
Total other expense, net	1,881	5,337	5,181	14,125
Income before income tax expense	63,055	45,359	114,482	47,743
Income tax expense	11,498	4,737	20,559	5,209
Net income	51,557	40,622	93,923	42,534
Less: Net income attributable to non-controlling interests	0	0	0	350
Net income loss attributable to noncontrolling interest of OneWater Marine Holdings LLC	17,054	26,255	31,158	26,732
Net (loss) income attributable to One Water Marine Holdings, LLC	34,503	14,367	62,765	15,452
New Boat [Member]
Revenues
Total revenues	288,222	294,678	679,704	530,249
Cost of sales (exclusive of depreciation and amortization shown separately below)
Total cost of sales	211,141	240,649	520,820	434,858
Pre-Owned Boat [Member]
Revenues
Total revenues	71,116	78,213	165,778	149,470
Cost of sales (exclusive of depreciation and amortization shown separately below)
Total cost of sales	52,566	63,594	125,566	122,803
Finance & Insurance [Member]
Revenues
Total revenues	15,238	16,639	32,990	29,047
Service, Parts & Other [Member]
Revenues
Total revenues	29,631	18,743	69,429	43,168
Cost of sales (exclusive of depreciation and amortization shown separately below)
Total cost of sales	$ 13,548	$ 9,345	$ 33,341	$ 22,815
Class A Common Stock [Member]
Other expense (income)
Earnings per share, Basic (in dollars per share)	$ 3.14	$ 2.36	$ 5.77	$ 2.54
Earnings per share, Diluted (in dollars per share)	$ 3.04	$ 2.36	$ 5.63	$ 2.54
Basic weighted-average shares outstanding (in shares)	10,976	6,088	10,884	6,088
Diluted weighted-average shares outstanding (in shares)	11,341	6,097	11,143	6,093