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FAIR VALUE MEASUREMENTS - Additional Information (Details) - Convertible debt investments - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Jan. 01, 2022 | Sep. 30, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cost basis of investment | $ 193.1 | $ 193.1
Unrealized gain on investment | 0.2 |
Investment income | 0.8 |
Amortized cost of investment | $ 194.2 | $ 193.4

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