CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net loss	$ (13,612)	$ (7,970)
Other comprehensive income (loss):
Foreign currency translation adjustment	20	(9)
Change in fair value of interest rate swaps, net of reclassification adjustment	7,289	0
Income tax expense associated with other comprehensive income items	(1,179)	0
Comprehensive loss	(7,482)	(7,979)
Net (income) attributable to non-controlling interests	0	(119)
Net loss attributable to non-controlling interests of One Water Marine Holdings, LLC	1,641	919
Foreign currency translation adjustment attributable to non-controlling interest of One Water Marine Holdings, LLC	(2)	1
Change in fair value of interest rate swaps, net of reclassification adjustment attributable to non-controlling interest of One Water Marine Holdings, LLC	(640)	0
Income tax expense associated with other comprehensive income items attributable to non-controlling interest of One Water Marine Holdings, LLC	103	0
Comprehensive loss attributable to OneWater Marine Inc.	$ (6,380)	$ (7,178)