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Components of Non-Operating Gains (Losses), Net (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Selected Account Information    
Gain on debt extinguishment $ 85 $ 4,949
Unrealized loss on equity securities (1) (33)
Non-operating gains, net $ 84 $ 4,916