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FAIR VALUE MEASUREMENTS - Additional Information (Details) shares in Millions, $ in Millions |  |  | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) shares | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | May 30, 2024 | Apr. 22, 2022 board_member nominee director | Aug. 24, 2021 board_member | Aug. 13, 2021 | Mar. 17, 2021 | Oct. 22, 2019 | Dec. 15, 2016
RIV Capital, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of company nominees added to the board | nominee |  |  |  |  |  |  | 4 |  |  |  |  |
Number of members of Board of Directors that can be nominated |  |  |  |  |  |  | 9 | 7 |  |  |  |
Debt Instrument, Ownership After Conversion, Common Shares | shares | 123.0 |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership after debt conversion |  | 47.00% |  |  |  |  |  |  |  |  |  |
RIV Capital, Inc. | The Hawthorne Colective |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of members of Board of Directors that can be nominated | board_member |  |  |  |  |  |  | 3 |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt other-than-temporary impairments |  |  | $ 64.6 | $ 101.3 | $ 0.0 |  |  |  |  |  |  |
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% | 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% | 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% | 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% | 5.25% |  |  |  |  |  |  |  | 5.25%
Convertible Notes Payable | RIV Capital, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion ratio on exchangeable shares |  |  |  |  |  | 0.23 |  |  |  |  |  |
Convertible debt investments |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Reductions for securities intended to be sold |  |  | $ 99.4 | $ 0.0 |  |  |  |  |  |  |  |
Cost basis of investment | $ 62.1 | $ 225.8 | 62.1 | 225.8 |  |  |  |  |  |  |  |
Unrealized loss on investment |  |  | 16.4 | 140.0 |  |  |  |  |  |  |  |
Allowance for credit loss | $ 1.9 | $ 101.3 | $ 1.9 | $ 101.3 | $ 0.0 |  |  |  |  |  |  |
Convertible debt investments | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt term (in years) |  |  | 5 years |  |  |  |  |  |  |  |  |
Convertible debt investments | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt term (in years) |  |  | 2 years 10 months 24 days |  |  |  |  |  |  |  |  |

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