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=120311839&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
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=121572278&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
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-Subparagraph (a)
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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

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Description of Company and Basis of Presentation (Details)	3 Months Ended		6 Months Ended
	Mar. 31, 2021 Store State	Mar. 31, 2020	Mar. 31, 2021 Store State Brand	Mar. 31, 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	72.90%		72.90%
Sales Revenue [Member] \| Product Concentration Risk [Member] \| Top Ten Brands [Member]
Description of the Business [Abstract]
Concentration risk percentage	41.10%	42.60%	39.80%	37.60%
Sales Revenue [Member] \| Product Concentration Risk [Member] \| Malibu Boats, Inc [Member]
Description of the Business [Abstract]
Concentration risk percentage	17.00%	16.90%	15.70%	16.20%