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FAIR VALUE MEASUREMENTS - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2021 | Aug. 13, 2021 | Mar. 17, 2021 | Oct. 22, 2019 | Dec. 15, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Increase in fair value | $ 12.0 |  |  |  |  |
Senior Notes | Senior Notes – 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 – 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 - 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 – 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] |  |  |  |  |  |
Cost basis of investment |  | $ 193.1 |  |  |  |
Unrealized loss on investment |  | 3.1 |  |  |  |
Investment income |  | 0.3 |  |  |  |
Amortized cost of investment |  | $ 193.4 |  |  |  |

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