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Equity-Based Compensation (FY) (Tables)
 12 Months Ended
Sep. 30, 2019
OneWater LLC [Member]  
Equity-Based Compensation [Abstract]  
Performance Stock Units Activity
Profit in Interests awards are as follows:

​
 
Non-Vested
Profits in
Interests
  
Vested
Profits in
Interests
  
Weighted
Average Grant
Date Fair Value
Per Share
 
Balance as of September 30, 2017
  
3,500
   
—
  
$
356
 
Granted
  
2,529
   
—
   
193
 
Forfeited
  
(2,187
)
  
—
   
189
 
Vested
  
(513
)
  
513
   
437
 
Balance as of September 30, 2018
  
3,329
   
513
  
$
352
 
Vested
  
(756
)
  
756
   
366
 
Balance as of September 30, 2019
  
2,573
   
1,269
  
$
348