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Related Person Transactions - Separation Arrangements (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2021 | Oct. 31, 2020 | Dec. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Related Party Transaction [Line Items] |  |  |  |  |  |
Equity based separation costs |  |  |  | $ 7,828 | $ 9,040 | $ 10,423
Separation costs |  |  |  | 1,881 | 7,050 | 3,730
Total separation costs |  |  |  | 1,881 | 7,050 | 3,730
Pension plan liability |  |  |  | 515 |  |
Forecast |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Equity based separation costs |  |  | $ 100 |  |  |
Cash separation costs |  |  | 1,300 |  |  |
David M. Blackman | Forecast |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Equity based separation costs |  |  | 300 |  |  |
Separation costs |  |  | 2,900 |  |  |
Total separation costs |  |  | $ 2,900 |  |  |
David M. Blackman | Subsequent Event |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Accelerated unvesting, number |  | 9,400 |  |  |  |
Former executive officers: |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Equity based separation costs |  |  |  | 281 | 1,488 | 483
Separation costs |  |  |  | 541 | 6,800 | 2,358
Cash separation costs |  |  |  | 260 | 5,312 | 1,875
Total separation costs |  |  |  | 541 | 6,800 | 2,358
Former executive officers: | Cash payment | David M. Blackman | Forecast |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction | $ 2,850 |  |  |  |  |
Former nonexecutive officers: |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Equity based separation costs |  |  |  | 24 | 97 | 0
Separation costs |  |  |  | 1,340 | 250 | 1,372
Cash separation costs |  |  |  | 1,316 | 153 | 1,372
Total separation costs |  |  |  | $ 1,340 | $ 250 | $ 1,372

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