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Borrowings - Narrative (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 01, 2022 | Jun. 01, 2012 | Mar. 31, 2024 | Jan. 31, 2010 | Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2025 | Mar. 31, 2024 | Jan. 28, 2025 | Jan. 27, 2025 | Sep. 30, 2024
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Debt repurchased |  |  |  |  | $ 0 |  |  | $ 0 |  |  |  |
Loss on extinguishment of debt, net |  |  |  |  | $ 0 | $ 424,000 |  | $ 0 | $ 437,000 |  |  |
Senior Notes | 7.500% |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, issued, principal |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |
Stated interest rate on debt instrument |  |  |  |  | 7.50% |  |  | 7.50% |  |  |  | 7.50%
Senior Notes | 6 .750% Senior Notes Maturing March of 2025 |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  | $ 197,900,000 |  |  |  | $ 4,300,000 |  |  |  |  |
Stated interest rate on debt instrument |  |  |  |  |  |  | 6.75% |  |  |  |  |
Loss on extinguishment of debt, net |  |  | $ 400,000 |  |  |  | $ 100,000 |  |  |  |  |
Junior Subordinated Notes |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Unamortized accretion |  |  |  |  | $ 23,336,000 |  |  | $ 23,336,000 |  |  |  | $ 24,369,000
Junior Subordinated Notes |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principle balance of notes |  |  |  |  | $ 100,800,000 |  |  | $ 100,800,000 |  |  |  |
Weighted average fixed interest rate of debt |  |  |  |  | 7.00% |  |  | 7.00% |  |  |  |
Junior Subordinated Debt, Modified Terms |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of debt |  |  |  |  | $ 25,800,000 |  |  | $ 25,800,000 |  |  |  |
Basis spread on variable rate |  |  |  | 2.71% |  |  |  |  |  |  |  |
Senior Unsecured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity, including letters of credit |  |  |  |  | 400,000,000 |  |  | 400,000,000 |  |  |  |
Credit facility, available increase in borrowing capacity |  |  |  |  | 35,000,000 |  |  | 35,000,000 |  |  |  |
Senior unsecured revolving credit facility |  |  |  |  | 55,000,000 |  |  | 55,000,000 |  |  |  | 0
Letters of credit secured using cash collateral |  |  |  |  | 17,400,000 |  |  | 17,400,000 |  |  |  |
Amount of available borrowings under the secured revolving credit facility |  |  |  |  | 292,600,000 |  |  | 292,600,000 |  |  |  |
Senior Unsecured Revolving Credit Facility | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity, including letters of credit |  |  |  |  | 365,000,000 |  |  | 365,000,000 |  | $ 365,000,000 | $ 300,000,000 |
Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit secured using cash collateral |  |  |  |  | 21,900,000 |  |  | 21,900,000 |  |  |  | $ 36,400,000
Letter of Credit | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity, including letters of credit |  |  |  |  | $ 100,000,000.0 |  |  | $ 100,000,000.0 |  |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 + Details
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