CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (6,176)	$ (39,111)	$ 152,611
Other comprehensive income (loss):
Foreign currency translation adjustment	(18)	9	(8)
Change in fair value of interest rate swaps	(2,066)	0	0
Comprehensive (loss) income	(8,260)	(39,102)	152,603
Net (income) attributable to non-controlling interests	(119)	(3,810)	(2,998)
Net loss (income) attributable to non-controlling interests of One Water Marine Holdings, LLC	590	4,329	(18,669)
Foreign currency translation adjustment attributable to non-controlling interest of One Water Marine Holdings, LLC	2	(1)	1
Change in fair value of interest rate swaps attributable to non-controlling interest of One Water Marine Holdings, LLC	184	0	0
Comprehensive (loss) income attributable to OneWater Marine, Inc.	$ (7,603)	$ (38,584)	$ 130,937