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v3.25.3

Borrowings - Narrative (Details) - USD ($) $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 01, 2022 | Jun. 01, 2012 | Jan. 31, 2010 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Jan. 28, 2025 | Jan. 27, 2025
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt repurchased |  |  |  | $ 0 |  |  |  |
Loss on extinguishment of debt |  |  |  | 0 | $ 437 | $ 546 |  |
6 3/4% Senior Notes Maturing March of 2025 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  | 202,200 | 9,000 |  |
Loss on extinguishment of debt |  |  |  |  | 400 | $ 100 |  |
Junior Subordinated Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principle balance of notes |  |  |  | $ 100,800 |  |  |  |
Weighted average fixed interest rate of debt |  |  |  | 7.02% |  |  |  |
Unamortized discount |  |  |  | $ 22,300 |  |  |  |
Junior Subordinated Debt, Modified Terms |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount of debt |  |  | $ 75,000 |  |  |  |  |
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 |  |  |  |
Basis spread on variable rate |  |  | 2.71% |  |  |  |  |
Senior Unsecured Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  | 400,000 |  |  |  |
Credit facility, available increase in borrowing capacity |  |  |  | 35,000 |  |  |  |
Line of credit |  |  |  | 0 | 0 |  |  |
Letters of credit secured using cash collateral |  |  |  | 41,400 |  |  |  |
Amount of available borrowings under the secured revolving credit facility |  |  |  | 323,600 |  |  |  |
Senior Unsecured Revolving Credit Facility | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  | 365,000 |  |  | $ 365,000 | $ 300,000
Letter of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Letters of credit secured using cash collateral |  |  |  | 0 | $ 36,400 |  |  |
Letter of Credit | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  | $ 100,000 |  |  |  |

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