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Preferred Units (Tables)
3 Months Ended
Dec. 31, 2021
Temporary Equity Disclosure [Abstract]  
Summary of Changes in Preferred Units
The tables below summarize the preferred unit activity during the year ended September 30, 2021:
UnitsAmount
(In thousands)
Balance, September 30, 2020504,168 $60,292 
Dividends paid in kind7,527 904 
Units converted to common units(511,695)(61,196)
Balance, September 30, 2021— $—