CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 11,673	$ 10,715	$ (8,939)	$ (3,272)
Other comprehensive income (loss):
Foreign currency translation adjustment	1	(47)	18	(48)
Change in fair value of interest rate swaps, net of reclassification adjustment	1,284	(2,003)	2,928	1,510
Income tax (expense) benefit associated with other comprehensive income items	(318)	496	(724)	252
Comprehensive income (loss)	12,640	9,161	(6,717)	(1,558)
Net loss attributable to non-controlling interests of One Water Marine Holdings, LLC	0	0	0	1,648
Foreign currency translation adjustment attributable to non-controlling interest of One Water Marine Holdings, LLC	0	0	0	(2)
Change in fair value of interest rate swaps, net of reclassification adjustment attributable to non-controlling interest of One Water Marine Holdings, LLC	0	0	0	(574)
Income tax benefit associated with other comprehensive income items attributable to non-controlling interest of One Water Marine Holdings, LLC	0	0	0	87
Comprehensive income (loss) attributable to OneWater Marine Inc.	$ 12,640	$ 9,161	$ (6,717)	$ (399)