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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Statement of Comprehensive Income [Abstract]        
Net loss $ (375) $ (4,509) $ (13,987) $ (12,479)
Other comprehensive income (loss):        
Foreign currency translation adjustment (21) 4 (1) (5)
Change in fair value of interest rate swaps, net of reclassification adjustment (3,776) 0 3,513 0
Income tax benefit (expense) associated with other comprehensive income items 935 0 (244) 0
Comprehensive loss (3,237) (4,505) (10,719) (12,484)
Net (income) attributable to non-controlling interests 0 0 0 (119)
Net loss attributable to non-controlling interests of One Water Marine Holdings, LLC 7 540 1,648 1,459
Foreign currency translation adjustment attributable to non-controlling interest of One Water Marine Holdings, LLC 0 0 (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 66 0 (574) 0
Income tax (benefit) expense associated with other comprehensive income items attributable to non-controlling interest of One Water Marine Holdings, LLC (16) 0 87 0
Comprehensive loss attributable to OneWater Marine Inc. $ (3,180) $ (3,965) $ (9,560) $ (11,143)