CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Revenues
Total revenues	$ 336,272	$ 214,083
Cost of sales (exclusive of depreciation and amortization shown separately below)
Total cost of sales	235,307	161,647
Selling, general and administrative expenses	59,096	34,860
Depreciation and amortization	1,749	963
Transaction costs	3,045	200
Change in fair value of contingent consideration	5,746	377
Income from operations	31,329	16,036
Other expense (income)
Interest expense - floor plan	877	920
Interest expense - other	1,529	924
Other expense (income), net	548	(94)
Total other expense, net	2,954	1,750
Income before income tax expense	28,375	14,286
Income tax expense	4,889	2,511
Net income	23,486	11,775
Less: Net income attributable to non-controlling interests	0	0
Less: Net income loss attributable to noncontrolling interest of OneWater Marine Holdings LLC	(3,467)	(3,987)
Net income attributable to OneWater Marine Inc	20,019	7,788
New Boat [Member]
Revenues
Total revenues	236,198	151,828
Cost of sales (exclusive of depreciation and amortization shown separately below)
Total cost of sales	175,896	122,532
Pre-Owned Boat [Member]
Revenues
Total revenues	53,449	38,580
Cost of sales (exclusive of depreciation and amortization shown separately below)
Total cost of sales	39,370	30,452
Finance & Insurance [Member]
Revenues
Total revenues	9,307	5,963
Service, Parts & Other [Member]
Revenues
Total revenues	37,318	17,712
Cost of sales (exclusive of depreciation and amortization shown separately below)
Total cost of sales	$ 20,041	$ 8,663
Class A Common Stock [Member]
Other expense (income)
Earnings per share, Basic (in dollars per share)	$ 1.50	$ 0.72
Earnings per share, Diluted (in dollars per share)	$ 1.45	$ 0.71
Basic weighted-average shares outstanding (in shares)	13,380	10,776
Diluted weighted-average shares outstanding (in shares)	13,761	10,986