CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenues
Total revenues	$ 214,083	$ 153,698
Cost of sales (exclusive of depreciation and amortization shown separately below)
Total cost of sales	161,647	121,509
Selling, general and administrative expenses	34,860	28,305
Depreciation and amortization	963	760
Transaction costs	200	437
Loss on contingent consideration	377	0
Income from operations	16,036	2,687
Other expense (income)
Interest expense - floor plan	920	2,659
Interest expense - other	924	1,853
Change in fair value of warrant liability	0	(771)
Other (income) expense, net	(94)	13
Total other expense, net	1,750	3,754
Income (loss) before income tax expense	14,286	(1,067)
Income tax expense	2,511	0
Net income (loss)	11,775	(1,067)
Less: Net income attributable to non-controlling interests		(247)
Net (loss) income attributable to One Water Marine Holdings, LLC	7,788
New Boat [Member]
Revenues
Total revenues	151,828	102,852
Cost of sales (exclusive of depreciation and amortization shown separately below)
Total cost of sales	122,532	85,955
Pre-Owned Boat [Member]
Revenues
Total revenues	38,580	33,071
Cost of sales (exclusive of depreciation and amortization shown separately below)
Total cost of sales	30,452	27,866
Finance & Insurance [Member]
Revenues
Total revenues	5,963	4,325
Service, Parts & Other [Member]
Revenues
Total revenues	17,712	13,450
Cost of sales (exclusive of depreciation and amortization shown separately below)
Total cost of sales	$ 8,663	7,688
Class A Common Stock [Member]
Other expense (income)
Earnings per share, Basic (in dollars per share)	$ 0.72
Earnings per share, Diluted (in dollars per share)	$ 0.71
Basic weighted-average shares outstanding (in shares)	10,776
Diluted weighted-average shares outstanding (in shares)	10,986
OneWater LLC [Member]
Other expense (income)
Less: Net income attributable to non-controlling interests	$ (3,987)
Net (loss) income attributable to One Water Marine Holdings, LLC		$ (1,314)