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Borrowings - Narrative (Details) |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 01, 2022 | Sep. 09, 2019 USD ($) | Jun. 01, 2012 | Jan. 31, 2010 USD ($) | Sep. 30, 2021 USD ($) lender | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | May 31, 2018 USD ($) | Oct. 31, 2017
Senior Notes [Abstract] |  |  |  |  |  |  |  |  |
Ownership interest In guarantor subsidiaries |  |  |  |  | 100.00% |  |  |  |
Loss on extinguishment of debt, net |  |  |  |  | $ 2,025,000 | $ 0 | $ 24,920,000 |  |
Senior Notes | Senior Unsecured Term Loans September 2022 |  |  |  |  |  |  |  |  |
Senior Unsecured Term Loan [Abstract] |  |  |  |  |  |  |  |  |
Aggregate principal amount of debt |  | $ 50,000,000 |  |  |  |  |  |  |
Periodic payment |  | $ 50,000,000 |  |  |  |  |  |  |
Stated interest rate on debt instrument |  | 4.875% |  |  |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 50,000,000 |  |  |  |  |  |  |
Senior Notes | 5 7/8% Senior Notes (2027 Notes) |  |  |  |  |  |  |  |  |
Senior Unsecured Term Loan [Abstract] |  |  |  |  |  |  |  |  |
Stated interest rate on debt instrument |  |  |  |  | 5.88% |  |  |  | 0.0588%
Senior Notes [Abstract] |  |  |  |  |  |  |  |  |
Repurchased senior debt |  |  |  |  |  | 30,700,000 |  |  |
Loss on extinguishment of debt, net |  |  |  |  | $ (2,000,000) |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  |  |  | 105.875% |  |  |  |
Junior Subordinated Notes |  |  |  |  |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |  |  |
Aggregate principle balance of notes |  |  |  |  | $ 100,800,000 |  |  |  |
Weighted average fixed interest rate of debt (percent) |  |  |  |  | 3.82% |  |  |  |
Unamortized discount |  |  |  |  | $ 30,600,000 |  |  |  |
Junior Subordinated Debt, Modified Terms |  |  |  |  |  |  |  |  |
Senior Unsecured Term Loan [Abstract] |  |  |  |  |  |  |  |  |
Aggregate principal amount of debt |  |  |  | $ 75,000,000 |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 75,000,000 |  |  |  |  |
Redemption price percentage |  |  | 75.00% |  |  |  |  |  |
Junior Subordinated Debt, Modified Terms | Forecast |  |  |  |  |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |  |  |
Annual increase of percentage of principal amount redeemable | 1.785% |  |  |  |  |  |  |  |
Junior Subordinated Debt, Modified Terms | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |  |  |
Variable rate floor |  |  |  | 4.25% |  |  |  |  |
Variable rate cap |  |  |  | 9.25% |  |  |  |  |
Junior Subordinated Debt, Original Terms |  |  |  |  |  |  |  |  |
Senior Unsecured Term Loan [Abstract] |  |  |  |  |  |  |  |  |
Aggregate principal amount of debt |  |  |  |  | 25,800,000 |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 25,800,000 |  |  |  |
Junior Subordinated Debt, Original Terms | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 2.45% |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 250,000,000 |  |  |  |
Line of credit facility, number of lenders | lender |  |  |  |  | 4 |  |  |  |
Inventory assets pledged as collateral |  |  |  |  | $ 1,100,000,000 |  |  |  |
Revolving Credit Facility |  |  |  |  | 0 | 0 |  |  |
Letters of credit secured using cash collateral |  |  |  |  | 0 | 0 |  |  |
Line of credit facility, remaining borrowing capacity |  |  |  |  | 250,000,000 |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |
Letters of credit secured using cash collateral |  |  |  |  | 21,800,000 | 12,700,000 |  |  |
Collateral amount |  |  |  |  | 22,300,000 | $ 12,900,000 |  |  |
Standby Letters of Credit | Standby Letter for Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | $ 50,000,000 |
Letters of credit secured using cash collateral |  |  |  |  | $ 11,800,000 |  |  |  |
Standby Letters of Credit | Backstop Standby Letters of Credit |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | $ 40,000,000 |

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