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v3.24.3

Borrowings - Narrative (Details) - USD ($) |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 01, 2022 | Jun. 01, 2012 | Jan. 31, 2010 | Jun. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Mar. 31, 2024
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  | $ (437,000) | $ (546,000) | $ 309,000 |
Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  | 300,000 |
7.500% Senior Notes (2031 Notes) | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount of debt |  |  |  |  |  |  |  | $ 250,000,000
6.750% Senior Notes (2025 Notes) | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  | 4,300,000 | 9,000,000 | 18,400,000 |
Redemption of debt |  |  |  |  | 197,900,000 |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  | (400,000) | (100,000) |  |
5.875% Senior Notes (2027 Notes) | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  | $ 6,000,000 |
Junior Subordinated Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principle balance of notes |  |  |  |  | $ 100,800,000 |  |  |
Weighted average fixed interest rate of debt |  |  |  |  | 7.97% |  |  |
Unamortized discount |  |  |  |  | $ 24,400,000 |  |  |
Junior Subordinated Debt, Modified Terms |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount of debt |  |  | $ 75,000,000.0 |  |  |  |  |
Variable rate floor |  |  | 4.25% |  |  |  |  |
Variable rate cap |  |  | 9.25% |  |  |  |  |
Redemption price percentage |  | 75.00% |  |  |  |  |  |
Annual increase of percentage of principal amount redeemable | 1.785% |  |  |  |  |  |  |
Junior Subordinated Debt, Original Terms |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount of debt |  |  |  |  | 25,800,000 |  |  |
Basis spread on variable rate |  |  | 2.71% | 2.45% |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  | 400,000,000 |  |  |
Credit facility, available increase in borrowing capacity |  |  |  |  | 100,000,000 |  |  |
Line of credit |  |  |  |  | 0 | 0 |  |
Letters of credit secured using cash collateral |  |  |  |  | 0 |  |  |
Amount of available borrowings under the secured revolving credit facility |  |  |  |  | 300,000,000.0 |  |  |
Revolving Credit Facility | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  | 300,000,000 |  |  |
Letter of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  | 100,000,000.0 |  |  |
Letters of credit secured using cash collateral |  |  |  |  | $ 36,400,000 | $ 31,200,000 |  |

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