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FAIR VALUE MEASUREMENTS - Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 01, 2023 | Jul. 02, 2022 | Jul. 01, 2023 | Jul. 02, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Total realized / unrealized gains (losses) included in OCI | $ 13.0 | $ (103.7) | $ (25.8) | $ (74.1)
Net Unrealized Gain (Loss) On Securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Total realized / unrealized gains (losses) included in OCI | 0.6 | (79.2) | (33.5) | (78.9)
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] |  |  |  |
Purchases | 0.0 | 25.0 | 0.0 | 25.0
Total realized / unrealized gains included in net earnings | 1.1 | 0.9 | 3.0 | 2.7
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 gains (losses) included in OCI | 0.6 | (79.2) | (33.5) | (78.9)
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 period | 84.8 | 192.4 | 117.0 | 190.3
Fair value at end of period | $ 86.5 | $ 139.1 | $ 86.5 | $ 139.1

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