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v3.21.2

Credit Facilities - Senior Secured Notes due 2025 (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 01, 2020 | Jun. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument offering price, percentage |  | 98.50% |  |  |
Debt instrument, redemption price, percentage | 100.00% | 108.625% | 100.00% |  |
Debt instrument, redemption price, percentage of principal amount redeemed |  | 40.00% |  |  |
Repayments of senior secured notes |  |  | $ 1,600,000 | $ 92,100,000 | $ 0
Debt instrument remaining outstanding |  |  | 500,000 |  |
Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face amount | $ 91,500,000 |  | $ 100,000,000 |  |
Debt instrument, redemption price, percentage |  | 100.00% | 103.00% |  |
Debt instrument, redemption price, percentage of principal amount redeemed |  |  | 103.00% |  |
Debt instrument, conversion price (in dollars per share) |  |  | $ 6.00 |  |
Senior Notes | Gain Capital Holdings Inc |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face amount |  |  | $ 92,000,000 |  |
Debt instrument, interest rate, stated percentage |  | 5.00% | 5.00% |  |
Debt instrument remaining outstanding |  | $ 500,000 |  |  |
Senior Notes Due Twenty Twenty Five |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face amount |  | $ 350,000,000 |  |  |
Debt instrument, interest rate, stated percentage |  | 8.625% | 8.625% |  |
Debt issuance costs, gross |  |  | $ 9,500,000 |  |
Debt instrument, redemption price, percentage |  |  | 103.00% |  |
Repayments of senior secured notes |  |  | $ 1,600,000 |  |

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