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FAIR VALUE MEASUREMENTS - Narrative (Details) - Convertible debt investments - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 28, 2024 | Sep. 30, 2024 | Dec. 30, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Cost basis of investment | $ 44.4 | $ 62.1 | $ 225.9
Gross unrealized losses on convertible debt instruments | 16.4 | 16.4 | 140.9
Allowance for expected credit losses | $ 1.9 | $ 1.9 | $ 101.3
Debt term | 4 years 8 months 12 days |  |

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