CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (39,111)	$ 152,611	$ 116,413
Other comprehensive income (loss):
Foreign currency translation adjustment	9	(8)	0
Comprehensive (loss) income	(39,102)	152,603	116,413
Net income attributable to non-controlling interests	(3,810)	(2,998)	0
Net loss (income) attributable to non-controlling interests of One Water Marine Holdings, LLC	4,329	(18,669)	(37,354)
Foreign currency translation adjustment attributable to non-controlling interest of One Water Marine Holdings, LLC	(1)	1	0
Comprehensive (loss) income attributable to One Water Marine Holdings, Inc.	$ (38,584)	$ 130,937	$ 79,059