CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Net loss	$ (12,901)	$ (375)	$ (20,612)	$ (13,987)
Other comprehensive income (loss):
Foreign currency translation adjustment	17	(21)	17	(1)
Change in fair value of interest rate swaps, net of reclassification adjustment	2,096	(3,776)	1,644	3,513
Income tax (expense) benefit associated with other comprehensive income items	(518)	935	(406)	(244)
Comprehensive loss	(11,306)	(3,237)	(19,357)	(10,719)
Net loss attributable to non-controlling interests of One Water Marine Holdings, LLC	0	7	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	66	0	(574)
Income tax (expense) benefit associated with other comprehensive income items attributable to non-controlling interest of One Water Marine Holdings, LLC	0	(16)	0	87
Comprehensive loss attributable to OneWater Marine Inc.	$ (11,306)	$ (3,180)	$ (19,357)	$ (9,560)