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Fair Value Measurements - Cash and Cash Equivalents (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 29, 2024	Sep. 30, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cost	$ 2,439.1	$ 2,722.5
Unrealized Gains	0.0
Unrealized Losses	0.0
Fair Value	2,439.1
Cash and Cash Equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	2,439.1
Cash
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cost	1,620.3
Unrealized Gains	0.0
Unrealized Losses	0.0
Fair Value	1,620.3
Cash | Cash and Cash Equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	1,620.3
Money Market Funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cost	371.2
Unrealized Gains	0.0
Unrealized Losses	0.0
Fair Value	371.2
Money Market Funds | Cash and Cash Equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	371.2
US Treasury Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cost	398.1
Unrealized Gains	0.0
Unrealized Losses	0.0
Fair Value	398.1
US Treasury Securities | Cash and Cash Equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	398.1
Commercial Paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cost	49.5
Unrealized Gains	0.0
Unrealized Losses	0.0
Fair Value	49.5
Commercial Paper | Cash and Cash Equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 49.5

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
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-Section 45
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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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-Publisher FASB
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