CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Revenues:
Total revenues	$ 1,936,310,000	$ 1,744,822,000	$ 1,228,206,000
Cost of sales (exclusive of depreciation and amortization shown separately below):
Total cost of sales	1,401,184,000	1,191,167,000	870,751,000
Selling, general and administrative expenses	345,524,000	302,113,000	199,049,000
Depreciation and amortization	23,898,000	15,605,000	5,411,000
Transaction costs	1,839,000	7,724,000	869,000
Change in fair value of contingent consideration	(1,604,000)	10,380,000	3,249,000
Loss on impairment	147,402,000	0	0
Income from operations	18,067,000	217,833,000	148,877,000
Other expense (income):
Interest expense – floor plan	25,080,000	4,647,000	2,566,000
Interest expense – other	34,557,000	13,201,000	4,344,000
Loss on extinguishment of debt	0	356,000	0
Other expense (income), net	953,000	3,793,000	(248,000)
Total other expense (income), net	60,590,000	21,997,000	6,662,000
Net (loss) income before income tax (benefit) expense	(42,523,000)	195,836,000	142,215,000
Income tax (benefit) expense	(3,412,000)	43,225,000	25,802,000
Net (loss) income	(39,111,000)	152,611,000	116,413,000
Net (income) attributable to non-controlling interests	(3,810,000)	(2,998,000)	0
Net loss (income) attributable to non-controlling interests of One Water Marine Holdings, LLC	4,329,000	(18,669,000)	(37,354,000)
Net (loss) income attributable to OneWater Marine Inc.	(38,592,000)	130,944,000	79,059,000
New boat
Revenues:
Total revenues	1,223,691,000	1,139,331,000	872,680,000
Cost of sales (exclusive of depreciation and amortization shown separately below):
Total cost of sales	955,222,000	834,026,000	661,764,000
Pre-owned boat
Revenues:
Total revenues	334,477,000	294,832,000	216,416,000
Cost of sales (exclusive of depreciation and amortization shown separately below):
Total cost of sales	258,524,000	213,167,000	162,278,000
Finance & insurance income
Revenues:
Total revenues	56,325,000	55,977,000	42,668,000
Service, parts & other
Revenues:
Total revenues	321,817,000	254,682,000	96,442,000
Cost of sales (exclusive of depreciation and amortization shown separately below):
Total cost of sales	$ 187,438,000	$ 143,974,000	$ 46,709,000
Class A Common Stock
Other expense (income):
Net (loss) earnings per share of Class A common stock – basic (in dollars per share)	$ (2.69)	$ 9.44	$ 7.13
Net (loss) earnings per share of Class A common stock – diluted (in dollars per share)	$ (2.69)	$ 9.13	$ 6.96
Basic weighted-average shares of Class A common stock outstanding (in shares)	14,328	13,877	11,087
Diluted weighted-average shares of Class A common stock outstanding (in shares)	14,328	14,337	11,359