CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Revenues:
Revenues		$ 1,744,822	$ 1,228,206	$ 1,022,970
Cost of sales (exclusive of depreciation and amortization shown separately below):
Cost of sales		1,191,167	870,751	787,446
Selling, general and administrative expenses		302,113	199,049	143,575
Depreciation and amortization		15,605	5,411	3,249
Transaction costs		7,724	869	3,648
Change in fair value of contingent consideration		10,380	3,249	6,762
Income from operations		217,833	148,877	78,290
Other expense (income):
Interest expense - floor plan		4,647	2,566	8,861
Interest expense - other		13,201	4,344	8,828
Change in fair value of warrant liability		0	0	(771)
Loss on extinguishment of debt		356	0	6,559
Other expense (income), net		3,793	(248)	(24)
Total other expense (income), net		21,997	6,662	23,453
Income before income tax expense		195,836	142,215	54,837
Income tax expense		43,225	25,802	6,329
Net income		152,611	116,413	48,508
Less: Net income attributable to non-controlling interests		(2,998)	0	(350)
Less: Net income attributable to non-controlling interests of One Water Marine Holdings, LLC		(18,669)	(37,354)	(30,733)
Net income attributable to OneWater Marine Inc.		130,944	79,059	17,425
New Boat [Member]
Revenues:
Revenues		1,139,331	872,680	717,093
Cost of sales (exclusive of depreciation and amortization shown separately below):
Cost of sales		834,026	661,764	585,720
Pre-Owned Boat [Member]
Revenues:
Revenues		294,832	216,416	205,650
Cost of sales (exclusive of depreciation and amortization shown separately below):
Cost of sales		213,167	162,278	168,261
Finance & Insurance [Member]
Revenues:
Revenues		55,977	42,668	36,792
Service, Parts & Other [Member]
Revenues:
Revenues		254,682	96,442	63,435
Cost of sales (exclusive of depreciation and amortization shown separately below):
Cost of sales		$ 143,974	$ 46,709	$ 33,465
Class A Common Stock [Member]
Other expense (income):
Earnings per share, Basic (in dollars per share)	[1]	$ 9.44	$ 7.13	$ 2.79
Earnings per share, Diluted (in dollars per share)	[1]	$ 9.13	$ 6.96	$ 2.77
Basic weighted-average shares outstanding (in shares)	[1]	13,877	11,087	6,243
Diluted weighted-average shares outstanding (in shares)	[1]	14,337	11,359	6,287

[1] For the fiscal year ended September 30, 2020, represents earnings per share of Class A common stock and weighted-average shares of Class A common stock outstanding for the period from February 11, 2020 through September 30, 2020, the period following OneWater Marine Inc.’s initial public offering. See Note 1.