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Summary of Significant Accounting Policies - Foreign Currency Translation (Detail) - USD ($) | 12 Months Ended
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Sep. 30, 2023 | Sep. 24, 2022 | Sep. 25, 2021
Accounting Policies [Abstract] |  |  |
Conversion Gains and Losses on Foreign Investments | $ (7,900,000) | $ 48,500,000 | $ (15,100,000)

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- Definition Represents gains or losses resulting from transactions conducted in foreign currencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 35 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482014/830-20-35-1 + Details
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