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v3.22.1

Borrowings - Narrative (Details) |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 01, 2022 | Sep. 09, 2019 USD ($) | Jun. 01, 2012 | Jan. 31, 2010 USD ($) | Mar. 31, 2022 USD ($) lender | Mar. 31, 2021 USD ($) | Mar. 31, 2022 USD ($) lender | Mar. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | May 31, 2018 USD ($) | Oct. 31, 2017
Senior Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Ownership interest In guarantor subsidiaries |  |  |  |  | 100.00% |  | 100.00% |  |  |  |
Loss on extinguishment of debt, net |  |  |  |  | $ 164,000 | $ 563,000 | $ 164,000 | $ 563,000 |  |  |
Junior Subordinated Notes |  |  |  |  |  |  |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Aggregate principle balance of notes |  |  |  |  | $ 100,800,000 |  | $ 100,800,000 |  |  |  |
Weighted average fixed interest rate of debt |  |  |  |  | 3.87% |  | 3.87% |  |  |  |
Unamortized accretion |  |  |  |  | $ 29,536,000 |  | $ 29,536,000 |  | $ 30,570,000 |  |
Junior Subordinated Debt, Modified Terms |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of debt |  |  |  | $ 75,000,000 |  |  |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  | 75.00% |  |  |  |  |  |  |  |
Junior Subordinated Debt, Modified Terms | LIBOR |  |  |  |  |  |  |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Variable rate floor |  |  |  | 4.25% |  |  |  |  |  |  |
Variable rate cap |  |  |  | 9.25% |  |  |  |  |  |  |
Junior Subordinated Debt, Modified Terms | Forecast |  |  |  |  |  |  |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Annual increase of percentage of principal amount redeemable | 1.785% |  |  |  |  |  |  |  |  |  |
Junior Subordinated Debt, Original Terms |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of debt |  |  |  |  | 25,800,000 |  | $ 25,800,000 |  |  |  |
Junior Subordinated Debt, Original Terms | LIBOR |  |  |  |  |  |  |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 2.45% |  |  |  |
Senior Unsecured Term Loans September 2022 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of debt |  |  |  |  | 50,000,000 |  | $ 50,000,000 |  |  |  |
Periodic payment |  | $ 50,000,000 |  |  |  |  |  |  |  |  |
Stated interest rate on debt instrument |  | 4.875% |  |  |  |  |  |  |  |  |
5 7/8% Senior Notes (2027 Notes) | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  | 6,000,000 |  | 6,000,000 |  |  |  |
Loss on extinguishment of debt, net |  |  |  |  | $ 200,000 |  | $ 200,000 |  |  |  |
5 7/8% Senior Notes (2027 Notes) | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate on debt instrument |  |  |  |  | 5.88% |  | 5.88% |  |  |  | 5.88%
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  |  |  |  |  | 105.875% |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  | $ 250,000,000 |  | $ 250,000,000 |  |  |  |
Number of lenders | lender |  |  |  |  | 4 |  | 4 |  |  |  |
Borrowings outstanding |  |  |  |  | $ 0 |  | $ 0 |  | 0 |  |
Letters of credit secured using cash collateral |  |  |  |  | 0 |  | 0 |  | 0 |  |
Amount of available borrowings under the secured revolving credit facility |  |  |  |  | 250,000,000 |  | 250,000,000 |  | 250,000,000 |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |
Letters of credit secured using cash collateral |  |  |  |  | 26,400,000 |  | 26,400,000 |  | 21,800,000 |  |
Collateral amount |  |  |  |  | 26,100,000 |  | 26,100,000 |  | $ 22,300,000 |  |
Standby Letters of Credit | Standby Letters for Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  |  |  |  |  | $ 50,000,000 |
Letters of credit secured using cash collateral |  |  |  |  | 8,200,000 |  | 8,200,000 |  |  |  |
Standby Letters of Credit | Backstop Standby Letters of Credit |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  | $ 40,000,000 |  | $ 40,000,000 |  |  |  |

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