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BORROWINGS - Notes Payable and Convertible Notes Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
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Oct. 31, 2025 USD ($) | Oct. 15, 2025 USD ($) | Sep. 22, 2025 $ / shares | Sep. 30, 2025 USD ($) day $ / shares | Aug. 31, 2023 USD ($) | Nov. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2025 USD ($) $ / shares | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Apr. 30, 2022 | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount |  |  |  | $ 406,500 |  |  |  |  | $ 406,500 | $ 257,000 | $ 257,000 | $ 200,000 |  | $ 188,813 | $ 96,313 | $ 57,500 | $ 0 | $ 0 | $ 0
Proceeds from issuance of notes payable |  |  |  |  |  |  |  |  | 147,258 | 0 | $ 57,000 |  |  |  |  |  |  |  |
Interest payable |  |  |  | 3,141 |  |  |  |  | 3,141 | $ 2,916 |  |  |  |  |  |  |  |  |
Notes Payable | 7.75% Notes due 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 7.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount |  |  |  |  | $ 57,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of notes payable |  |  |  |  | $ 55,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable, fair value disclosure |  |  |  | 57,300 |  |  |  |  | 57,300 |  |  |  |  |  |  |  |  |  |
Notes Payable | 7.75% Notes due 2028 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount |  | $ 57,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of principal amount redeemed |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable | 3.75% Notes due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 3.75% |  |  |  |  |  |  | 3.75% |  |  |  |  |  |
Aggregate amount |  |  |  |  |  | $ 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of notes payable |  |  |  |  |  | 48,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable, fair value disclosure |  |  |  | 48,000 |  |  |  |  | 48,000 |  |  |  |  |  |  |  |  |  |
Interest payable |  |  |  |  |  | $ 1,900 |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable | 5.125% Notes due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 5.125% | 5.125% |  |  |  |  |  |  |  |  |  |  |
Aggregate amount |  |  |  |  |  |  | $ 50,000 | $ 100,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of notes payable |  |  |  |  |  |  | $ 50,600 | $ 97,700 |  |  |  |  |  |  |  |  |  |  |
Notes payable, fair value disclosure |  |  |  | $ 149,400 |  |  |  |  | $ 149,400 |  |  |  |  |  |  |  |  |  |
Notes Payable | 5.125% Notes due 2026 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount | $ 150,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of principal amount redeemed | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt | 2030 Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 5.875% |  |  |  |  | 5.875% |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 149,500 |  |  |  |  | $ 149,500 |  |  |  |  |  |  |  |  |  |
Proceeds from convertible debt |  |  |  | 142,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest payable |  |  |  | $ 8,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion rate |  |  | 0.03861 | 0.0384394 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  | $ 25.90 | $ 26.02 |  |  |  |  | $ 26.02 |  |  |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger |  |  |  | 130.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold trading days | day |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold consecutive trading days | day |  |  |  | 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt, fair value |  |  |  | $ 146,900 |  |  |  |  | $ 146,900 |  |  |  |  |  |  |  |  |  |
Convertible Debt | 2030 Convertible Notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion rate |  |  |  | 0.0422834 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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