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FAIR VALUE MEASUREMENTS - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Aug. 13, 2021 | Mar. 17, 2021 | Oct. 22, 2019 | Dec. 15, 2016
Operating expenses |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |
Convertible debt investment impairment |  | $ 64.6 | $ 101.3 |  |  |  |
Senior Notes | Senior Notes due 2031 – 4.000% |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |
Interest rate (percent) | 4.00% | 4.00% |  |  | 4.00% |  |
Senior Notes | Senior Notes due 2032 – 4.375% |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |
Interest rate (percent) | 4.375% | 4.375% |  | 4.375% |  |  |
Senior Notes | Senior Notes due 2029 - 4.500% |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |
Interest rate (percent) | 4.50% | 4.50% |  |  |  | 4.50% |
Senior Notes | Senior Notes due 2026 – 5.250% |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |
Interest rate (percent) | 5.25% | 5.25% |  |  |  |  | 5.25%
Convertible debt investments |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |
Reductions for securities intended to be sold | $ 0.0 | $ 99.4 |  |  |  |  |
Cost basis of investment | 44.4 | 62.1 |  |  |  |  |
Unrealized loss on investment | 19.8 | 16.4 |  |  |  |  |
Allowance for credit loss | $ 1.9 | $ 1.9 | $ 101.3 |  |  |  |
Convertible debt investments | Minimum |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |
Debt term (in years) | 4 years |  |  |  |  |  |

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