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FAIR VALUE MEASUREMENTS - Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 30, 2023 | Dec. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total realized / unrealized losses included in OCI | $ (8.8) | $ (26.0)
Net Unrealized Gain (Loss) On Securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total realized / unrealized losses included in OCI | (0.9) | (26.8)
Fair value, inputs, level 3 | Fair Value, Measurements, Recurring | Convertible debt investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Investment income | 0.1 | 1.0
Fair value, inputs, level 3 | Fair Value, Measurements, Recurring | Convertible debt investments | Net Unrealized Gain (Loss) On Securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total realized / unrealized losses included in OCI | (0.9) | (26.8)
Fair value, inputs, level 3 | Estimated Fair Value | Fair Value, Measurements, Recurring | Convertible debt investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value at beginning of year | 85.8 | 117.0
Fair value at end of year | $ 85.0 | $ 91.2

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