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v3.22.2.2

Borrowings - Narrative (Details) - USD ($) |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 13, 2022 | Jun. 01, 2022 | Jun. 01, 2012 | Jan. 31, 2010 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt, net |  |  |  |  | $ 309,000 | $ (2,025,000) | $ 0
Senior Notes | 5.875% Senior Notes (2027 Notes) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repurchased senior debt |  |  |  |  | 6,000,000 | 30,700,000 | 0
Gain (loss) on extinguishment of debt, net |  |  |  |  | 300,000 | (2,000,000) | $ 0
Senior Notes | 6.750% Senior Notes (2025 Notes) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repurchased senior debt |  |  |  |  | 18,400,000 |  |
Junior Subordinated Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principle balance of notes |  |  |  |  | $ 100,800,000 |  |
Weighted average fixed interest rate of debt (percent) |  |  |  |  | 5.23% |  |
Unamortized discount |  |  |  |  | $ 28,500,000 |  |
Junior Subordinated Debt, Modified Terms |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount of debt |  |  |  | $ 75,000,000 |  |  |
Redemption price percentage |  |  | 75.00% |  |  |  |
Annual increase of percentage of principal amount redeemable |  | 1.785% |  |  |  |  |
Junior Subordinated Debt, Modified Terms | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate floor |  |  |  | 4.25% |  |  |
Variable rate cap |  |  |  | 9.25% |  |  |
Junior Subordinated Debt, Original Terms |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount of debt |  |  |  |  | $ 25,800,000 |  |
Junior Subordinated Debt, Original Terms | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 2.45% |  |
Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 250,000,000 |  |
Secured Revolving Credit Facility |  |  |  |  | 0 | 0 |
Letters of credit secured using cash collateral |  |  |  |  | 5,500,000 | 0 |
Line of credit facility, remaining borrowing capacity |  |  |  |  | 244,500,000 | 244,500,000 |
Collateral amount |  |  |  |  | 1,060,000,000.00 |  |
Revolving Credit Facility | Subsequent Event |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | $ 265,000,000 |  |  |  |  |  |
Line of credit facility, increase to size of the commitments | 135,000,000 |  |  |  |  |  |
Revolving Credit Facility | Subsequent Event | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | $ 400,000,000 |  |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Letters of credit secured using cash collateral |  |  |  |  | 29,700,000 | 21,800,000 |
Collateral amount |  |  |  |  | $ 31,500,000 | $ 22,300,000 |

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + Details
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