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Related Person Transactions - Separation Arrangements (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Oct. 31, 2020
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Related Party Transaction [Line Items]          
Separation costs   $ 217 $ 0 $ 217 $ 4,159
Pension plan liability     515   515
Former Executive Officer          
Related Party Transaction [Line Items]          
Cash separation costs   0 0 0 2,900
Equity based separation costs   0 0 0 295
Separation costs   0 0 0 3,195
Former Nonexecutive Officer          
Related Party Transaction [Line Items]          
Cash separation costs   217 0 217 805
Equity based separation costs   0 0 0 159
Separation costs   $ 217 $ 0 $ 217 $ 964
David M. Blackman          
Related Party Transaction [Line Items]          
Number of accelerated vesting shares (in shares) 9,400        
David M. Blackman | Former Executive Officer | Cash payment          
Related Party Transaction [Line Items]          
Related party transaction $ 2,850