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Income Taxes - Activity of Company's Unrecognized Income Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 28, 2024 | Sep. 30, 2023 | Sep. 24, 2022
Income Tax Disclosure [Abstract] |  |  |
Balance at beginning of fiscal year | $ 256.5 | $ 247.6 | $ 212.8
Tax positions related to current year: |  |  |
Additions | 7.8 | 6.8 | 45.9
Tax positions related to prior years: |  |  |
Additions related to change in estimate | 11.8 | 4.5 | 21.5
Reductions | (2.1) | 0.0 | (6.6)
Lapses in statutes of limitations and settlements | (0.8) | (2.4) | (26.0)
Balance as of the end of the fiscal year | $ 273.2 | $ 256.5 | $ 247.6

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10B -Publisher FASB -URI https://asc.fasb.org//1943274/2147482525/740-10-45-10B + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A + Details
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