Description of Company and Basis of Presentation (Details)	12 Months Ended
	Sep. 30, 2025 center state location brand shares	Sep. 30, 2024 shares	Sep. 30, 2023	Oct. 31, 2023
Description of Company and Basis of Presentation [Line Items]
Number of retail locations | location	95
Number of distribution centers | center	9
Number of states in which entity operates | state	19
Number of top brands | brand	10
Economic interest of quality assets and operations	100.00%	80.00%
Acquired Economic Interest of Quality Assets and Operations				20.00%
OneWater LLC
Description of Company and Basis of Presentation [Line Items]
Ownership interest of parent	100.00%
Class A Common Stock
Description of Company and Basis of Presentation [Line Items]
Common stock, shares, issued (in shares) | shares	16,373,991	14,686,696
Revenue Benchmark | Product Concentration Risk | Top Ten Brands
Description of Company and Basis of Presentation [Line Items]
Concentration risk, percentage	40.80%	41.70%	39.40%
Revenue Benchmark | Supplier Concentration Risk | Malibu Boats, Inc
Description of Company and Basis of Presentation [Line Items]
Concentration risk, percentage	12.20%	13.10%	13.90%