Description of Company and Basis of Presentation (Details) - OneWater LLC [Member]	3 Months Ended
	Dec. 31, 2019 Dealergroup Store State Brand Subsidiary	Dec. 31, 2018
Description of the Business [Abstract]
Number of dealer groups acquired | Dealergroup	17
Number of stores acquired	40
Number of stores operating	63
Number of states in which stores operating | State	11
Number of top brands | Brand	10
Principles of Consolidation [Abstract]
Number of minority member subsidiaries consolidated | Subsidiary	2
South Shore Assets and Operations [Member]
Principles of Consolidation [Abstract]
Percentage of voting rights	100.00%
Ownership interest in subsidiaries	75.00%
Bosun's Assets and Operations [Member]
Principles of Consolidation [Abstract]
Percentage of voting rights	100.00%
Ownership interest in subsidiaries	75.00%
Sales Revenue [Member]
Description of the Business [Abstract]
Concentration risk percentage	41.80%	45.20%
Sales Revenue [Member] | Malibu Boats, Inc [Member] | Supplier Concentration Risk [Member]
Description of the Business [Abstract]
Concentration risk percentage	14.40%	11.90%