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Fair Value Measurements - Fair Value Assets and Liabilities Measured Using Unobservable Inputs (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 24, 2022 | Sep. 25, 2021
Fair Value Disclosures [Abstract] |  |  |
Beginning balance | $ 23.4 | $ 75.1 | $ 81.8
Contingent consideration recorded at acquisition | 1.1 | 0.0 | 0.0
Fair value adjustments | (14.9) | (39.5) | (6.7)
Payments | (7.6) | (12.2) | 0.0
Ending balance | $ 2.0 | $ 23.4 | $ 75.1

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- Definition Amount of increase (decrease) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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