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FAIR VALUE MEASUREMENTS - Rollforward (Details) - USD ($) $ in Millions	3 Months Ended
	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

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481830/320-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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- Definition

The aggregate amount of income from investments (for example, dividends) not considered a component of the entity's core operations.

+ References

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-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
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-Subparagraph (SX 210.5-03.7)
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- Definition

Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent.

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