Summary of Significant Accounting Policies (FY) (Tables)

9 Months Ended

12 Months Ended

Jun. 30, 2020

Sep. 30, 2019

Summary of Significant Accounting Policies [Abstract]

Dilutive Effect of Profits in Interest Unit Agreements and Common Warrants Outstanding

The following table sets forth the calculation of earnings per share for the three and nine months ended June 30, 2020 (in thousands, except per share data):

Earnings per share:	Three Months Ended June 30, 2020		Nine Months Ended June 30, 2020
Numerator:
Net income attributable to OneWater Inc	$	14,367	$	15,452
Denominator:
Weighted-average number of unrestricted outstanding common shares used to calculate basic net income per share		6,088		6,088
Effect of dilutive securities:
Restricted stock units		9		5
Diluted weighted-average shares of Class A common stock outstanding used to calculate diluted net income per share		6,097		6,093
Earnings per share of Class A common stock – basic	$	2.36	$	2.54
Earnings per share of Class A common stock – diluted	$	2.36	$	2.54

OneWater LLC [Member]

Summary of Significant Accounting Policies [Abstract]

Estimated Useful Lives of Assets

The estimated useful lives of assets are as follows:

	Years
Company vehicles		5
Buildings and improvements		10-39
Leasehold improvements		15
Machinery and equipment		5-7
Office equipment		5-7

Dilutive Effect of Profits in Interest Unit Agreements and Common Warrants Outstanding

The following table illustrates the dilutive effect of profits in interest unit agreements and common warrants outstanding:

	2019		2018		2017
Common units outstanding		76,121		75,333		75,000
Weighted average common unit equivalents outstanding		27,175		28,371		25,379
Diluted common unit equivalents		103,296		103,704		100,379