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Preferred Units - Summary of Changes in Preferred Units (Details) - USD ($)
$ in Thousands
5 Months Ended 12 Months Ended
Feb. 26, 2021
Sep. 30, 2021
Sep. 30, 2020
Increase (Decrease) in Temporary Equity [Roll Forward]      
Beginning balance $ 60,292 $ 60,292  
Ending balance   $ 0 $ 60,292
Series A preferred units      
Increase (Decrease) in Temporary Equity [Roll Forward]      
Beginning balance (in Units) 504,168 504,168 475,152
Beginning balance $ 60,292 $ 60,292 $ 56,810
Dividends paid in kind (in Units)   7,527 29,016
Dividends paid in kind   $ 904 $ 3,482
Units converted to common units (in Units) (511,695) (511,695)  
Units converted to common units $ (61,200) $ (61,196)  
Ending balance (in Units)   0 504,168
Ending balance   $ 0 $ 60,292