v3.25.1
Stockholders’ Equity - Summary of Net (Loss) Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Numerator:        
Net loss attributable to OneWater Inc $ (368) $ (3,969) $ (12,339) $ (11,139)
Class A Common Stock        
Denominator:        
Weighted-average number of unrestricted outstanding common shares used to calculate basic net (loss) income per share (in shares) 15,968 14,579 15,393 14,559
Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract]        
Diluted weighted-average shares of Class A common stock outstanding used to calculate diluted net (loss) earnings per share (in shares) 15,968 14,579 15,393 14,559
Net (loss) earnings per share of Class A common stock – basic (in usd per share) $ (0.02) $ (0.27) $ (0.80) $ (0.77)
Net (loss) earnings per share of Class A common stock – diluted (in usd per share) $ (0.02) $ (0.27) $ (0.80) $ (0.77)
Class A Common Stock | Employee Stock        
Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract]        
Restricted stock unit and employee stock purchase plan (in shares) 0 0 0 0
Class A Common Stock | Restricted Stock Units        
Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract]        
Restricted stock unit and employee stock purchase plan (in shares) 0 0 0 0