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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, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
Related Party Transaction [Line Items]            
Separation costs   $ 0 $ 385 $ 4,159 $ 645  
Pension plan liability           $ 515
Former Executive Officer            
Related Party Transaction [Line Items]            
Cash separation costs   0 0 2,900 260  
Equity based separation costs   0 281 295 281  
Separation costs   0 281 3,195 541  
Former Nonexecutive Officer            
Related Party Transaction [Line Items]            
Cash separation costs   0 80 805 80  
Equity based separation costs   0 24 159 24  
Separation costs   $ 0 $ 104 $ 964 $ 104  
David M. Blackman            
Related Party Transaction [Line Items]            
Number of accelerated vesting shares (in shares) 9,400          
David M. Blackman | Cash payment | Former Executive Officer            
Related Party Transaction [Line Items]            
Related party transaction $ 2,850