For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13531-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13537-108611

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Description of Company and Basis of Presentation (Details)	3 Months Ended		9 Months Ended
	Jun. 30, 2021 Store State	Jun. 30, 2020	Jun. 30, 2021 Store State Brand	Jun. 30, 2020
Description of the Business [Abstract]
Number of stores operating \| Store	69		69
Number of states in which stores operating \| State	10		10
Number of top brands \| Brand			10
OneWater LLC [Member]
Principles of Consolidation [Abstract]
Ownership interest in subsidiaries	77.50%		77.50%
Sales Revenue [Member] \| Product Concentration Risk [Member] \| Top Ten Brands [Member]
Description of the Business [Abstract]
Concentration risk percentage	42.90%	44.10%	41.10%	41.70%
Sales Revenue [Member] \| Product Concentration Risk [Member] \| Malibu Boats, Inc [Member]
Description of the Business [Abstract]
Concentration risk percentage	19.00%	19.20%	17.10%	17.80%