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BORROWINGS - Notes Payable Narrative (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2023 | Nov. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Oct. 31, 2019 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Apr. 30, 2022 | Nov. 01, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 257,000,000 | $ 200,000,000 | $ 188,813,000 |  |  | $ 96,313,000 | $ 57,500,000 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
Proceeds from issuance of notes payable |  |  |  |  |  | 57,000,000 | 50,000,000 | $ 150,000,000 |  |  |  |  |  |  |  |  |
Interest payable |  |  |  |  |  | 2,956,000 | $ 2,517,000 |  |  |  |  |  |  |  |  |  |
Notes Payable | 7.75% Notes due 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 57,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 7.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of notes payable | $ 55,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest payable | $ 4,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable, fair value disclosure |  |  |  |  |  | 57,100,000 |  |  |  |  |  |  |  |  |  |  |
Notes Payable | 3.75% Notes due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 3.75% |  |  |  |  |  |  | 3.75% |  |  |  |  |  |  |  |
Proceeds from issuance of notes payable |  | $ 48,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest payable |  | $ 1,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable, fair value disclosure |  |  |  |  |  | 44,500,000 |  |  |  |  |  |  |  |  |  |  |
Notes Payable | 5.125% Notes due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 50,000,000 | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 5.125% | 5.125% |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of notes payable |  |  | $ 50,600,000 | $ 97,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest payable |  |  | $ 7,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable, fair value disclosure |  |  |  |  |  | $ 143,100,000 |  |  |  |  |  |  |  |  |  |  |
Notes Payable | 5.375% Notes due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | $ 38,800,000 |  |  |  |  | $ 38,800,000 |  |  |  |  |  |  |
Interest rate |  |  |  |  | 5.375% |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of notes payable |  |  |  |  | $ 37,500,000 |  |  |  |  |  |  |  |  |  |  |  |

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